Question about 2005 Toyota Corolla

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Codes po303, po171, po137. po420 - 2005 Toyota Corolla

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2000 Toyota Corolla, P0171 & P0420 codes - YouTube

? 5:43
https://www.youtube.com/watch?v=ahJnJ19-vwY
Jun 13, 2011 - Uploaded by StandardBrandParts
Standard Motor Products presents: Technician's Toolbox "2000Toyota Corolla, P0171 & P0420 codes"

Smoke testing for codes P0171 P0174 - YouTube

? 5:48
https://www.youtube.com/watch?v=kZsqEfP-5zM
Jan 18, 2011 - Uploaded by realfixesrealfast
These two codes mean a V style engine is running lean on both banks. So you have to be thinking - what can ...

How to repair fault code P0171 and reset warning light ...

? 26:31
https://www.youtube.com/watch?v=Y8FBGrCT3rM
Nov 27, 2014 - Uploaded by Peter Finn
How to repair and fix fault or error code P0171 and reset warning light Toyota Corolla VVT-i engine. ... Also how to find fault codeusing OBD scanner. ... Trouble shooting a misfire, Code P0300, P0301, P0302, P0303, P0304, P0305, P0306, ... 2000 Toyota Corolla, P0171 & P0420 codes - Duration: 5:43. by ...

Posted on Dec 02, 2015

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2005 Cadillac won't start. no ignition fire. codes po300,po014,po340,po341, po345, po346, po420, po430, po171, po174


codes p 0014, 0340, 0341, 0345, 0346 all refer to the cam shaft position sensor==causes include-- advance mechanism faulty - CMP sensor --insecure cam rotor --wiring short to ground --air gap--ECM
codes p 0420, 0431 refer to the cat converter=== causes --cat converter failed ---wiring --- HO2S ( heated oxygen sensor)
code p 171 is a faulty HO2S sensor and
p 174 refers to system too lean bank 2===causes --intake /exhaust leak---fuel pressure /pump---injectorr/s AIR system---hose connection/s

Nov 16, 2015 | 2005 Cadillac STS

1 Answer

Engine misfires. Battery dead/fixed. Po303 code: Changed plugs/wires, code cleared/reappeared. Misfiring again. Po420 code/then cleared. Po306 code. Replaced coil tower. Misfired again..


You either have a bad catalytic converter causing too much back pressure or you are running rich. I think cylinder 3 and 6 are on the same side of the engine (except opposite banks) right? Locate the fuel pressure regulator. Is it on the same side? I've seen those go bad and allow fuel to be sucked into the vacuum line causing a rich condition/ misfire on two or three cylinders on that side of the engine.

Nov 13, 2015 | 2005 Dodge Caravan

1 Answer

2000 Lexus GS300 I have codes po300 po302, po303, po304, po305, po306,po171


We can't help you here

You need the car diagnosed

I doubt you have lifters,should have
OHC valve train

Most likely the oil passages are clogged up
in the cams with sludge

That's what happens when the wrong oil
& too long between changes takes place

You ruin the engine

Dec 23, 2012 | Cars & Trucks

1 Answer

Check engine light obd code po171,po300,po302,po303 1997 camry 2.2 ltr.


PO171 OBD2 Code basically this means that an oxygen sensor in bank 1 has detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1. The P0171 is one of the more common trouble codes.

his code is triggered by the first downstream (front) O2 sensor. The sensor provides a reading of the air:fuel ratio leaving the engine's cylinders, and the vehicles powertrain/engine control module (PCM/ECM) uses that reading and adjusts to keep the engine running at that optimum ratio of 14.7:1. If something is not right and the PCM cannot maintain the 14.7:1 ratio, but rather there is too much air, it triggers this code.

Nov 06, 2012 | 1997 Toyota Camry

1 Answer

Im trying to get my mother in laws 2006 chevy equinox to pass emissions the codes po171 and po420 keep coming up po171 is lean bank one and po420 is catalyst below efficency im trying to narrow it down to...


For the lean condition I wound look for vacuum leaks.I you don`t find any then replace the o2 sensor for bank 1.As for the po420 if the exhaust system is not bent or damaged you will have to replace the catalytic converter.The catalytic converter has a longer warranty then the regular vehicle warranty itself so call the dealership and find out if the converter is still under warranty.The usual warranty I believe is around 80k.mileage years is 7 or 8 not positive.Hope this helps.Good luck.

Sep 15, 2010 | Chevrolet Equinox Cars & Trucks

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