Question about 2002 Chevrolet Blazer

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Po128,po155,po171,po300 These are the things that faile on my 2002 chevy blazer when I took it to the Maryland state emmissions test. Do you know what they are?

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P0128 (Coolant thermostat-coolant temp below thermostat regulating temperature) Possible cause-Mechanical fault

P0155 (Heated oxygen sensor (H)2S)1, bank 2,-circuit malfunction) Possible cause Wiring, H02S, ECM

P0171 (System to lean, ban 1) possible cause intake blocked, EVAP canister purge valve, fuel pressure, EGR system, injector(s), H02S

P0300 (Random/multiple cylinder(s)-misfire detected) Possible causes Spark plug(s), HT lead(s), injector(s), ignition coil(s), low compression, or wiring.

Posted on Sep 05, 2009

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3 Answers

Gm code po300


This is a misfire code. Start with the basics, fuel filter, spark plugs, vacuum leaks, wires etc. If after checking/changing necessary parts, if problem persists you will need to go deeper as in coils and computer controlled parts such as map sensor, maf sensor

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Trouble code p0106 / po128 / po300 / po606


po106 MAP/BARO sensor range preformance po128 thermostat range is below regulated temp po300 random engine misfire po606 PCM internal preformance error. some one has chipped there engine.

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Trouble codes for 2003 Chevy Blazer


Code 155 is for a problem with the heater circuit in the O2 sensor for bank two. Bank two is on the side with cylinder number two.
Usually the sensor is faulty, but the heater circuit would need to be checked to be sure. The sensor has a built-in heater to get it hot quickly after starting the engine.

Jul 10, 2013 | Cars & Trucks

1 Answer

My 2002 VW Passet is diagnosing a PO155, PO300, PO301,PO304 & PO305


The 300 codes are misfire codes, do a tune up and that should fix the problem. the 155 i will have to investigate and try to see what it is.

Apr 10, 2011 | 2002 Volkswagen Passat

1 Answer

I have a 95 Tahoe with 158000 miles. In Maryland you have to get your vehicle emmission tested every 2yrs and mine passed the highway speed and lower speed exhaust emmissions but failed at idle test. Is...


could be a slight air leak on the exhaust like a small rust hole and its drawing in the air ,the proper way is to put a probe up the tailpipe but without knowing what the results were its very difficult to diagnose ,was it too high on O2 as this signifies a hole in the exhaust ,was it too high on CO or CO2 ,You see our test is every year on vehicles over ten years of age and it also includes a mechanical test as well but the emmisions is done with a probe not the OBDII as very few europeon vehicles can be read via the OBDII as they nearly all use encrypted software now from 2005 .

Mar 07, 2011 | 1995 Chevrolet Tahoe

1 Answer

2002 Blazer, 4.3L engine, Code PO128. Is it the thermostat or thermostat sensor? Thanks in advance, Dennis


hi this is showing that the thermostat is u/s it is stuck open, hope this helps

Nov 04, 2010 | 2002 Chevrolet Blazer

1 Answer

1996 olds cutlas supreme, 3.1 L has trouble codes PO171 and PO300. Any Ideas?


The po300 is a misfire code.This means there is probably a plug,plug wire,ignition coil,or ignition module.Check the coil towers one at a time.These are know for corroding.If you find one that is corroded then replace the plug wire also.Po171 is a lean condition code.The po300 could be causing the po171.If you have not had a tune up Now would be a good time.Hope this helps.Good luck.

Jan 06, 2010 | 1996 Oldsmobile Cutlass Supreme Coupe

1 Answer

Chevy S-10 p0300 and po507


if it is reving at idol I would be checking my throttle body for air leaks your computer will tell your engine to loop higher, to try and correct the readings it is getting.

Nov 17, 2009 | 2002 Chevrolet Blazer

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