Question about 2002 Mitsubishi Lancer

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How many oxygen sensors does a 2002 Mitsubishi Lancer?

How many sensors does a 2002 Mitsubishi Lancer have

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4cylinder will have only two. A v6 will have at least 3 probably 4.

Posted on Aug 18, 2009

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Why am i getting engine code p0421 on this 2002 mitsubishi lancer?


this code is lazy cat (or weak or dead)420's are very hard to diagnose
here is the order.
1: NO EXHAUST leaks near any oxy sensor. zero, (cracks, or gaskets) any where near or upstream of any oxy sensor.!!!
2: Engine runs perfectly CEL out running and no stored or live DTCS (besides 421) and engine holds closed loop at hot idle and light flat cruise, steady right foot, if not , the CAT gets punished.
3: good front oxz sensors, a mUST.
4: AND 2nd last , new rear cat sensors (421s come from this sensor)
5: a NEW cat.

that is the crash course, can do 100s pages.
but no. just 1.

Jun 28, 2014 | 2002 Mitsubishi Lancer

1 Answer

Car consuming 1 liter per 3 km. Car is 1997 mitsubishi lancer pizza. Also emits black smoke


That engine is getting too much fuel. Check the air filters and the oxygen sensors. IT could also be the injectors.

Apr 09, 2014 | 2004 Mitsubishi Lancer

1 Answer

What is the tourque of an input sensor of 2002 mitsubishi lancer?


All the Mitsubishi Lancers shared the same horsepower of 120 hp, including the 2002 model. -------------------------------------------------------------------------------
Motorola 711 Programmer

Mar 26, 2013 | 2002 Mitsubishi Lancer

1 Answer

2002 mitsubishi lancer code po421


P0421 - Warm Up Catalyst Efficiency Below Threshold (Bank 1)
Basically this means that the oxygen sensor downstream of the catalytic converter on bank 1 is detecting that the converter is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.

Symptoms: You will likely not notice any drivability problems, although there may be symptoms. The code may be more likely to occur after the engine has had numerous cold starts in the past 1-2 days.

Causes: A code P0421 may mean that one or more of the following has happened:
The catalytic converter is no longer functioning properly
An oxygen sensor is not reading (functioning) properly
A sparkplug is fouled up

Possible Solutions: Measure the voltage at the oxygen sensor on Bank 1 (the rear sensor, or the sensor after the converter). In fact, it would be a good idea to test each oxygen O2 sensor while you're at it.

One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.


hope this helps (remember to rate and comment this answer).

Jun 09, 2011 | 2002 Mitsubishi Lancer

1 Answer

I own a Mitsubishi Shogun Pinin- 2002 1.8 MPi Animal 3d Auto and I need a front oxygen sensor but I dont know the part number or what brand I can buy - the dealership is very expensive


Mitsubishi, by experience seem to run fine on universal lambda sensors.

If your wire colours are:

2 Blacks, 1 Blue & 1 White
or
2 White, 1 Grey & 1 Black

Then it will be standard Zirconia. Just buy a 4 wire uni- zircona sensor.

If you are UK the part number is 86400

Nov 27, 2009 | 2002 Mitsubishi Lancer

1 Answer

2003 Lancer the service engine soon light keeps coming on, have changed out both O2 sensors and the gas cap, the code is P0421. The light comes on about 15 miles after filling up with gas


I can see that you've done the right things, but something is still amiss... Mitsubishi says

A code P0421 may mean that one or more of the following has happened:
  • The catalytic converter is no longer functioning properly
  • An oxygen sensor is not reading (functioning) properly
  • A sparkplug is fouled
Measure the voltage at the oxygen sensor on Bank 1 (the rear sensor, or the sensor after the converter). In fact, it would be a good idea to test each oxygen O2 sensor while you're at it.

One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.

Sep 23, 2009 | 2003 Mitsubishi Lancer

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