Question about 2002 Pontiac Grand Am

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O2 sensor What does the 02 sensor do? What problems can it cause if it is not working properly? How can you tell which one is bad? Can it affect the shifting of the transmission going into passing gear?

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  • Pontiac Master
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The O2 sensor does exactly what the name suggests, it registers the amount of Oxygen in your exhaust and the computer will adjust the amount of fuel entering the engine to maintain an optimal air fuel ratio to achieve the most fuel efficient ratio.Your engine will still run with a bad O2 sensor, you will just get poor fuel mileage and can eventually clog the catalytic converter. The computer will tell you which sensor it is that is not reading correctly.

Posted on Aug 30, 2014

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Posted on Jan 02, 2017

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Richard Scordino

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SOURCE: 97 firbird automatic not shifting properly when accelerating some

You could change the fluid and add a good conditioner like lucas, but even if it works better, you are only buying time. Unit is likely beginning to wear out.

Posted on Apr 15, 2009

Anonymous

  • 169 Answers

SOURCE: runs but not change gears

if the speedo works sensors ok what trans in car 3t40 or 4t40e can you shift it manually or will it finally shift at red line

Posted on Aug 29, 2009

Anonymous

  • 1 Answer

SOURCE: own a 1996 Grand AM GT 2.4 quad 4..manual...engine

engine missfire won't start

Posted on Dec 13, 2009

stmic47

  • 564 Answers

SOURCE: 2002 pontiac grand am will not shift oh highway no passing gear.

ck fluid level,,ck color or smell it to see if it smells burnt,,trans filter could be plug up

Posted on Feb 04, 2010

James Young

  • 4044 Answers

SOURCE: 2002 Grand Am GT transmission problem.

Well, there could be several possible problems. It is not uncommon to have a little harder shifting after a fluid change for a period if the system was low prior to the change however, If you had the fluid changed using one of those reverse flush machines I see the problem getting worse. Most stations want to use the back flush system to do a fluid change now days. That is because the newer model vehicle have a metal filter screen which is re-usable and is designed at the factory to use Synthetic Fluid. In the older model vehicles, 2000 to 2005, manufacturers where still mixing the types of filters that were being used. This model has a standard filter that model uses the newer filter. If you went to Jiffy Lube and didn't specify you wanted a regular Fluid and Filter change they hooked it to the machine and charged $140+ for the job. A regular Filter and fluid change with regular fluid would have run about $50. Every time, and I mean Every time, I have had a fluid change using that back flush machine on a vehicle within 6 months I have had to have the Transmission repaired at a shop. If you didn't have the fluid changed using that backflush machine then your problem is just adjustment to the new fluid being at the proper level. If you did, start saving for a Transmission rebuild at a shop, it's not far away.

Posted on Jul 19, 2010

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Code p0130 and code p0150


These 2 articles are from another source. They explain exactly what all the causes and cures are for your Codes. The problem seems to be on the #2 bank. P0130 - 02 Sensor Circuit Malfunction (Bank I Sensor 1) Article by
dale.jpg
Dale Toalston
ASE Certified Technician OBD-II Trouble Code Technical Description

02 Sensor Circuit Malfunction (Bank I Sensor 1)
What does that mean? The O2 sensor produces a voltage based on oxygen content in the exhaust. The voltage varies between .1 and .9 Volts, .1 indicating lean and .9 indicating rich.
The ECM constantly monitors this voltage while in closed loop to determine how much fuel to inject. If the ECM determines that the O2 sensor voltage was too low (less than .4 Volts) for too long (for more than 20 seconds (time varies with model)), this code is set.
Potential Symptoms Depending if the problem is intermittent or not, there may be no symptoms other than MIL (malfunction indicator lamp) illumination. If the problem is constant, then symptoms may include one or more of the following:

  • MIL illumination
  • Engine runs rough, missing or stumbling
  • Blows black smoke from tail pipe
  • Engine dies
  • Poor fuel economy
Causes Usually the cause of P0130 is a bad oxygen sensor, however this isn't always the case. If your o2 sensors haven't been replaced and they are old, it's a good bet that the sensor is the problem. But, It could be caused by any of the following:
  • Water or corrosion in the connector
  • Loose terminals in the connector
  • Wiring burnt on exhaust components
  • Open or short in the wiring due to rubbing on engine components
  • Holes in exhaust allowing unmetered oxygen into exhaust system
  • Unmetered vacuum leak at the engine
  • Bad o2 sensor
  • Bad PCM
Possible Solutions Using a scan tool, determine if the Bank 1, sensor 1 is switching properly. It should switch rapidly between rich and lean, evenly.
1. If it does, the problem is likely intermittent and you should examine the wiring for any visible damage. Then perform a wiggle test by manipulating the connector and wiring while watching the o2 sensor voltage. If it drops out, fix the appropriate part of the wiring harness where problem resides.
2. If it doesn't switch properly, try to determine if the sensor is accurately reading the exhaust or not. Do this by removing the fuel pressure regulator vacuum supply briefly. The o2 sensor reading should go rich, reacting to the extra fuel added. Reinstall regulator supply. Then induce a lean condition by removing a vacuum supply line from the intake manifold. The o2 sensor reading should go lean, reacting to the enleaned exhaust. If the sensor operates properly, then the sensor may be okay and the problem may be holes in the exhaust or an unmetered vacuum leak in the engineicon1.png (NOTE: Unmetered vacuum leaks at the engine are almost always accompanied by lean codes. Refer to the appropriate articles for diagnosing an unmetered vacuum leak). If the exhaust does have holes in it, it's possible that the o2 sensor may be misreading the exhaust because of the extra oxygen entering the pipe via those holes
3. If none of this is the case and the o2 sensor just isn't switching or acts sluggish, unplug the sensor and make sure there is 5 Volt reference voltage to the sensor. Then check for 12V supply to the o2 sensor's heater circuit. Also check for continuity to ground on the ground circuit. If any of these are missing, or aren't their proper voltage, repair open or short in the appropriate wire. The o2 sensor will not operate properly without proper voltage. If the proper voltages are present, replace the o2 sensor.
Register now to ask a question (free) Related P0130 DTC Discussions P0150 - 02 Sensor Circuit Malfunction (Bank 2 Sensor 1) OBD-II Trouble Code Technical Description

02 Sensor Circuit Malfunction (Bank 2 Sensor 1)
What does that mean? The O2 sensor produces a voltage based on oxygen content in the exhaust. The voltage varies between .1 and .9 Volts, .1 indicating lean and .9 indicating rich.
The ECM constantly monitors this voltage while in closed loop to determine how much fuel to inject. If the ECM determines that the O2 sensor voltage was too low (less than .4 Volts) for too long (for more than 20 seconds (time varies with model)), this code is set. The code P0150 refers to Bank 2.
Potential Symptoms Depending if the problem is intermittent or not, there may be no symptoms other than MIL (malfunction indicator lamp) illumination. If the problem is constant, then symptoms may include one or more of the following:

  • MIL illumination
  • Engine runs rough, missing or stumbling
  • Blows black smoke from tail pipe
  • Engine dies
  • Poor fuel economy
Causes Usually the cause of P0150 is a bad oxygen sensor, however this isn't always the case. If your o2 sensors haven't been replaced and they are old, it's a good bet that the sensor is the problem. But, It could be caused by any of the following:
  • Water or corrosion in the connector
  • Loose terminals in the connector
  • Wiring burnt on exhaust components
  • Open or short in the wiring due to rubbing on engine components
  • Holes in exhaust allowing unmetered oxygen into exhaust system
  • Unmetered vacuum leak at the engine
  • Bad o2 sensor
  • Bad PCM
Possible Solutions Using a scan tool, determine if the Bank 2, sensor 1 is switching properly. It should switch rapidly between rich and lean, evenly.
1. If it does, the problem is likely intermittent and you should examine the wiring for any visible damage. Then perform a wiggle test by manipulating the connector and wiring while watching the o2 sensor voltage. If it drops out, fix the appropriate part of the wiring harness where problem resides.
2. If it doesn\'t switch properly, try to determine if the sensor is accurately reading the exhaust or not. Do this by removing the fuel pressure regulator vacuum supply briefly. The o2 sensor reading should go rich, reacting to the extra fuel added. Reinstall regulator supply. Then induce a lean condition by removing a vacuum supply line from the intake manifold. The o2 sensor reading should go lean, reacting to the enleaned exhaust. If the sensor operates properly, then the sensor may be okay and the problem may be holes in the exhaust or an unmetered vacuum leak in the engineicon1.png (NOTE: Unmetered vacuum leaks at the engine are almost always accompanied by lean codes. Refer to the appropriate articles for diagnosing an unmetered vacuum leak). If the exhaust does have holes in it, it's possible that the o2 sensor may be misreading the exhaust because of the extra oxygen entering the pipe via those holes
3. If none of this is the case and the o2 sensor just isn't switching or acts sluggish, unplug the sensor and make sure there is 5 Volt reference voltage to the sensor. Then check for 12V supply to the o2 sensor's heater circuit. Also check for continuity to ground on the ground circuit. If any of these are missing, or aren't their proper voltage, repair open or short in the appropriate wire. The o2 sensor will not operate properly without proper voltage. If the proper voltages are present, replace the o2 sensor.
Register now to ask a question (free) Related P0150 DTC Discussions
  • 1996 Nissan Maxima P0150 P0136 P0105 P0130
    I own a 1996 Nissan Maxima, automatic, v6. Started to shut down on me when making stops. Always cranked back up. Changed out knock sensor, starter, air flow, battery cables...few other minor things. Still doing same thing but not near as often. After all this, codes read P0150, P0136 and P0105. Era...

Dec 15, 2013 | 2012 Lincoln MKX Base 4dr SUV 3.7L V6...

1 Answer

What do i have to change if codes po1151 and po155 come up on my 1999 lincoln town car?


P0155 - 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)
This code refers to the front oxygen sensor on Bank 2. The heated circuit in the oxygen sensor decreases time needed to enter closed loop. As the O2 heater reaches operating temperature, the oxygen sensor responds by switching according to oxygen content of the exhaust surrounding it. The ECM tracks how long it takes for the oxygen sensor to begin switching. It the ECM determines (based on coolant temp) that too much time elapsed before the oxygen sensor began operating properly, it will set P0155. See also: P0135 (Bank 1).

Potential Symptoms: You will likely notice poor fuel economy the illumination of the MIL.

Causes: A code P0155 may mean that one or more of the following has happened:
O2 Heater element resistance is high
Internal short or open in the heater element
O2 heater circuit wiring high resistance
open or short to ground in the wiring harness

Possible Solutions:
Repair short or open or high resistance in wiring harness or harness connectors
Replace oxygen sensor (cannot repair open or short that occurs internally to sensor)



P0156 - 02 Sensor Circuit Malfunction (Bank 2 Sensor 2)
The o2 (oxygen) sensors measure oxygen content in the exhaust. The PCM (powertrain control module) then uses this information to regulate fuel injector pulse. The o2 sensors are very important for the proper operation of the engine. Innacurate or faulty o2 sensors can cause the PCM to add or take away fuel based on the faulty o2 sensor voltage which can cause a host of problems.

A P0156 code refers to the Bank 2,2 o2 sensor or the downstream (post-cat) o2 sensor on Bank 2. It is a four wire sensor. The PCM supplies a ground circuit and a reference voltage circuit of about 0.5 volts. Also for the o2 sensor heater element there is a battery voltage supply wire and another ground circuit for that. The o2 sensor heater allows the o2 sensor to warm up faster, thus achieving closed loop in less time than it would normally take for the exhaust to warm the sensor up to operating temperature. The O2 sensor varies the supplied reference voltage based on oxygen content in the exhaust. It is capable of varying from about 0.1 to 0.9 volts, 0.1 V indicating lean exhaust and 0.9 V indicating rich exhaust. This P0156 code indicates that the Bank 2, 2 o2 sensor is stuck low for too long or isn\'t active at all.

Symptoms: Often post-cat o2 sensor problems present few symptoms since they are inputs to the PCM to monitor catalytic converter quality and don\'t directly control fuel. sometimes no symptoms are noticeable. However the following may be possible on some vehicles:
MIL (Malfunction Indicator Lamp) illumination
Decrease in MPG
Increase in tailpipe emissions

Causes: Potential causes of an P0156 code include:
Bad O2 sensor
Signal shorted to voltage
Wiring problems due to contact with exhaust components
Holes in exhaust near o2 sensor

Possible Solutions:
If you have access to a scan tool, check the signal voltage for the Bank 2,2 oxygen sensor with the engine at normal operating temperature. Is it stuck low currently? If so, increase RPM for a few seconds and see if it affects the reading. If it begins working with increased RPM, check for holes in the exhaust near the o2 sensor that may cause a false lean. If the exhaust pipe is intact, the sensor is sluggish, replace it.

If the Bank 2,2 o2 sensor voltage reading remains low with increased RPM, unplug it and then observe the reading. It should have increased to about 0.5 volts or thereabouts. If it did, check for water intrusion or other connector problems. If none are found, replace the shorted o2 sensor. If the voltage reading is still stuck low after unplugging the sensor, then suspect a wiring problem. Using a voltmeter, with the o2 sensor unplugged, check for voltage on the signal circuit at the o2 sensor connector(PCM side). It can vary with model, but should be about 0.5 volts and not above 1 volt. If the voltage reading is too high, repair short to voltage on signal circuit. If the signal voltage checks out, suspect the PCM.


Hope this helps (remember to rate this answer).

Jun 06, 2011 | Lincoln Town Car Cars & Trucks

1 Answer

I have an 02 s10 it has been having a code for #2 o2 sencer heater not working could this be my problem?


the O2 sensor heater circuit is just what it says it is a heater fo the O2 sensor, it is there to make sure the sensor stays a constant temperature, the sensors like a lot of heat, if the heater is not working the sensor will not give proper info. about the amount of O2 ( oxygen ) in the exhaust flow which could cause the engine to run to rich or lean in either case the engine will not perform as good as it should and can cost you fuel mileage, it the worst case sanario the heater can short to the sensor return wire and cause all kinds of bad things to happen like cook the ECM, i suggest you replace the sensor, the #2 sensor will be the one after the catholic converter.

Mar 15, 2011 | 2005 Chevrolet Suburban

1 Answer

I have a 1996 silverado with the 5.7l vortec engine. My Service engine soon light came on today so i took my truck to advance. They read a code PO172-System running rich (bank 1) and my exhaust has a...


the code indicates a bank 1problem.so anything that is common between both sides of the motor will not set this code,if anything it would set a different code and show a common code for both sides of the motor,vacuum leak would not be the problem as it would also affect the way the motor runs,bad /dirty maf sensor again affects both sides and a code difference,bad coolant again affects both sides and different code,an 02 sensor can show which side the problem is and could cause the setting code.bad spark plugs can also cause this code, an injector one or more for this side can cause this,bad fuel pressure regulator will affect both sides again.so I would check spark plugs, check the 02 sensor for proper voltage readings on the left side of the motor(driver`s side),it`s uncommon for injectors on one side to only go bad and not injectors on both sides.if the plugs are okay and don`t need changing you may need to check for tune-up items such as plug wires.it sounds like the motor is not burning the fuel properly giving the rich running code

Mar 10, 2011 | Chevrolet 1500 Cars & Trucks

1 Answer

I have a 04 f150 with the 5.4 check engine light is on and it read o2 sensor changed twice still read same problem


you have to figure out what is causing the 02 to activate the light, lean or rich exhaust emissions? what its saying is the sensor is working and it has detected a bad emissions or fuel mix in the exhaust, it is not telling you the 02 is bad, thats what the sensors do they detect faults with temps,knocks,emissions, timing,crank position, fuel air mix,throttle position. so the 02 is detecting something and that something is what needs to be found.

Jan 21, 2011 | Ford F-150 Cars & Trucks

2 Answers

Fuel mixture is too rich, O2 sensors replaced but still reports O2 sensor is bad. What else could problem be?


O2 sensors that are bad for awhile will affect the MAP sensor to go bad as well. Go to Auto Zone and they will provide a FREE scan of the engines computer. They will tell you what needs to be replaced or looked at

Jul 11, 2010 | 1999 Buick Century

1 Answer

P0431 code on audi allroad 02


Typcally caused by one of the front oxygen sensors or a bad ground associated with these sensors.Replace both front sensors with direct fit type NOT universal, because there may be a cracked wire and the universal sensor does not contain the complete wire harness. Direct fits, are about $20 more than universal fit type.

The O2 sensors have integrated heating elements that bring them up to the proper operating temperature. Code P0431 indicates that the O2 sensor on your driver side catalytic converter is not reaching the proper operating range. The O2 sensors are usually in the $150 range online.

Nov 25, 2009 | 2003 Audi A6

2 Answers

Non-california emission O2 sensor for other 49 states


Probably not. The California car is all together different. Usre the Cal, O2 Sensor.

Nov 11, 2009 | 2000 Toyota Camry Solara

1 Answer

Engine light codes 02-3151 and P0420


Code P0420 is a code for Catalyst efficiency. The computer is seeing the post Catalytic converter o2 sensor having too much activity. The Cat. should be cleaning the exaust of Hc, co, and Nox. The post cat o2 will read the o2 content in the exhaust and if it moves up and down too much or to high and low, the computer interperates that as the cat not ridding the exhaust of it's pollutants. This indicates that the converter is unable to preform properly. The problem could be a bad cat, o2 sensor (Pre- and/or post cat)or o2 sensor wires, or an air fuel mixture problem that has caused the cat to fail. Many other engine operating system failures can cause the converter to not work properly.

Sep 10, 2009 | 2000 Toyota Corolla

2 Answers

2004 Chevy Blazer O2 Sensor


there are two 02 sensors actually on the engine. bank one is cylinders 1 3 5 bank 2 is 2 4 6. it controls the fuel to air ratio, if the O2 sensor is not working, the engine goes into limp mode, which means it is just putting as much fuel as possible into the cylinder, which will effect your gas mileage.

The O2 sensor may be fine, the pigtails off the 02 sensor go bad, the connection. I had in my car, i change the 02 sensor twice, then I found someone said the pigtails may be bad, so I cut the cars wiring harness pigtail, and the one coming off the 02 sensor, and directly wired it with the original truck 02 sensor, and it worked. all 02 sensors look similar, they screw in the side of the engine, and just have 4 wires coming off of it.

Try your origional one, and just bypassing the original wire connector, what I did was cut it off, skinned the wires, put some heat shrink rap on it, combined the wires together soldered them together, and heated the wire shrink rap, so that way it is water proof. car works perfect now.

Jan 09, 2009 | 2004 Chevrolet TrailBlazer

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