Question about 2005 Pontiac Sunfire

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Code po172 p0172 code-Would a bad O2 Sensor not allow my engine to start?

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1 Answer

No

But not changing front or upstream O2 Sensors
on all vehicles at 100,000 won't help with fuel control

Posted on Mar 26, 2014

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 112 Answers

SOURCE: 2002 Pontac Grand Prix GTP P0171 code engine stumbling at times

Bank 1 is the frt side exhaust manifold (did they say bank 1 sensor 1?),you can start by replacing that sensor,i would check the intake for leaks ,the gm 6cly. are known for bad intake gaskets,you will see oil coming out form the frt or rear of the intake,also check your atifreeze overflow bottle for bronwish sludge,which means that the oil is mixing with the antifreeze.A leaking intake could cause that lean condition.

Posted on Mar 29, 2009

  • 112 Answers

SOURCE: O2 Sensor replacement

most cars have only 2 o2 sensors one is below the exaust manifold and the other one near the catalytic converter

Posted on May 27, 2009

fingaz22
  • 1068 Answers

SOURCE: 2000 Pontiac Sunfire, 2.2 litre engine, automatic.

i wouldn't be looking at the o2 sensors! look at the coolant temp sensor! when the car is cold it doesn't correct fuel & air ratio until it is warm so it is not looking at the o2's till then! if the sensor is bad and telling the computer it is warm when it is cold them it would be leaned out and run like that then when the car gets warm it's fine because the sensor is still saying it's warm! would be the opisite if it went bad and was telling the computer it was cold! that is a sure sign of the temp sensor being bad! good luck

Posted on Sep 18, 2009

Testimonial: "Thanks. I'll look into that. Coolant sensors are a lot cheaper than O2 sensors too. :-)"

  • 28 Answers

SOURCE: Code P0141. O2 Sensor heater circuit fault (Bank1,

It is probably the sensor before the cat. if it has a heater. The heater circuit going bad is a common problem, it does not affect the way the car runs after it warms up, it is an emission device to heat the O2 sensor up quicker than the hot exhaust gas would. It should be replaced because it will keep your check engine light on and you would not be able to pass an emission test.

Posted on Oct 12, 2009

  • 561 Answers

SOURCE: Service Engine soon light on - diagnostic code

O2 is the symbol for oxigen so it could well be the airflow sensor this is usually in the air duct between the air filter and the intake manifold should usually not be difficult to replace.

Posted on Nov 13, 2009

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I have a 2003 trailblazer with 4.2 engine. Losing power when driving especially when going up hill (even small hill). Will drop down to 15 mph. got a code of p0172. Replaced O2 sensor and the...


Yes , it is more then likely the Catalytic converter is clogged ! Pull the O2 sensor before the Cat an do a back pressure test ! Testing for plugged clogged restricted exhaust converter An your P0172 means you have a rich condition , does not mean O2 sensor is bad ! Do you have 4.3 L vortex ? Could be bad fuel pressure regulator leaking ! caused your cat to have a melt down an starting to plug ! 4.3L or 5.0L vortex engines . with spider injectors ! chevy vortec p0172 p0175 So you have two problems ! Hope this helps !

Mar 09, 2015 | 2003 Chevrolet TrailBlazer

1 Answer

Volvo 2001 s60 t5 can't keep the ralenti rpm at less than 1500rpm, the car constantly shut off.


code po172 is your bank 1 o2 sensor and code po121 is your throttle posit sensor that controls your RPMs .code po102 is your maf -mass air flow sensor. and code 01172 is a throw in code from the others cause problem. you need a o2 sensor and mass air flow sensor and throttle position senor

Dec 10, 2012 | Cars & Trucks

2 Answers

2001 hyundai santa fe with obd 2 code po172 i bought this vehicle and now it wont pass smog


An O2 sensor is never the cause of a fault code P0172, you through your hard earned money away. Read about the code and the possible causes at the link below.

P0172 OBD II Trouble Code System Too Rich Bank 1 YourMechanic Advice

Jul 09, 2017 | 2001 Hyundai Santa Fe

1 Answer

Po172


P0172 CHEVROLET - Fuel Trim System Rich Bank 1

Possible causes- Faulty front heated oxygen sensor

- Ignition misfiring
- Faulty fuel injectors

- Exhaust gas leaks

- Incorrect fuel pressure

- Faulty Mass Air Flow (MAF) sensor

Jun 11, 2012 | 2005 Dodge Caravan SXT

1 Answer

I have a few error codes for my 2004 dodge ram hemi 1500 4x4. they are po172, po300, and po304.


The p0172 is due to an O2 sensor in the exhaust seeing too much oxygen, the po300 is a missfire present and p0304 is cylinder #4 missfire, check plug and wire to #4 and repair, this should also take care of the p0172, if a cylinder is missing it is just pump air into the exhaust thus causing the code p0172.

Jan 13, 2012 | Cars & Trucks

2 Answers

Scan code p0172 cylinder too rich what is cause


please go to this site, it will explain the po172 in greater detail. www.obd-codes.com/po172 hope this helps. good-day !

Nov 09, 2011 | 2005 Chevrolet Impala

3 Answers

Engine wont stay on when started unless you step on the gas,service engine soon " light comes on.Scanned it and you get code po172 system too rich.


Okay, lets start with you checking the fuel preasure regulator, this is a common problem with these the regulator leaks and the vac line connected to it starts sucking gas into the intake, this causing it to run rich and depending on how bad the leak is it will stall engine at idle, remove the vacuum hose from regulator and start engine then see if gas shoots out the vac connection on the regulator, if it does then replace regulator, hope this helps.583ec1c.jpg

Oct 18, 2010 | 1999 Pontiac Grand Prix

2 Answers

5 error cods on my 2002 Jetta GLS 1.8 Turbo Engine


P0420= Catalyst System Efficiency Below Threshold Bank 1
P0300=Random/Multiple Cylinder Misfire Detected
P0301=Cylinder 1 Misfire Detected
P0172=System Too Rich Bank 1
P2181=Cooling System Performance
you need to write these down,have someone clear the codes in the car,then go for short ride and recheck which if any code reappears.it's like domino's affect,one sensor can start a chain affect with the others.

Dec 09, 2009 | 1998 Volkswagen Jetta

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