Question about Pontiac Sunfire

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99 Pontiac Sunfir. having problems with my check engine light. Throws a code PO141 Replaced the O2 sensor, spark plugs, spark wires, and air filter. what else can it be. Please help!!

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I think it,s your check engine light. but if theres still a problem check to see if your battery is chargeing you might need a new battery . let me know

Posted on Mar 28, 2011


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How to reset check engine light?

First replace the bank 2 sensor 1 O2 sensor. p0051 is that sensor heater circuit. These codes are always the O2 sensor, unless you see the wires are melted against the exhaust manifold. Once replaced the light will eventually go out. A code reader or scanner will turn it off.

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Hello I have a 96 Pontiac sunfire with codespo172

PO141 is caused by the O2 heater circuit wiring has a high resistance like an open or short to ground. the heater circuit element in the O2 sensor has an open or short. code PO172 is set when the O2 sense too much fuel is supplied and not burning completely. could be caused by a bad MAF/dirty sensor caused by dirt on the sensor wire or dirty air filter/over oiled filter if you use a K&N filter that requires it to be oiled. fuel pressure is too high causing too much fuel to enter cylinders. even fuel volume can cause this like a dirty injector allowing too much fuel to enter the cylinders. since these codes deal with the O2 sensor replace the sensor as they are a problem then clear codes and drive to see if codes reappear. or if you have a digital volt ohm meter you can test the wiring, check the MAF sensor wire for dirt and clean with intake cleaner.

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Why does my engine stall at a stop sign

Stall? I'll tell you few problems might be:
1. vacuum hose leaking 2. spark plug and wiring 3. EGR 3. O2 sensors 4. Fuel Pressure low. Reason--> Bad pump, or bad fuel filter 5. Idle sensor 6. Cat muffler clogged
Most trouble you need to check is could be Idle Sensor, EGR, O2 Sensor. If your light came on (SERVICE ENGINE SOON OR CHECK ENGINE) And if its ODO2 then you can take car to auto parts store for free code scanner to see what's error.

Feb 13, 2011 | Pontiac LeMans Cars & Trucks

1 Answer

P134, p0141, po300, po130 and po135. 2005 Sunfire.

Given that most of the trouble codes are for the O2 sensor, I think I would change it. The multiple misfires could be because of improper fuel/air mixture caused by a bad sensor. Disconnect the negative(-) battery terminal then change the sensor. Disconnecting the negative(-) should reset the computer and allow the fuel/air mixture to return to default allowing the engine to start.
P0130 - O2 Sensor Circuit Malfunction (Bank 1 Sensor 1)
P0134 - O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
P0135 - O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
P0141 - O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
P0300 - Random/Multiple Cylinder Misfire Detected

Jun 16, 2010 | 2005 Pontiac Sunfire

2 Answers


probably not the o2 sensor but some other problem causing that code does it say bank 1 lean or rich?

Jan 24, 2010 | 2001 Pontiac Grand Prix

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1997 Pont Grand Prix ---- P0303 again & again

I would inspect the connecter and wires for the #3 cylinder fuel injector for damage.

Aug 17, 2009 | 1996 Pontiac Grand Prix

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Replaced both sensors in a 2004 Pontiac Grand Prix P0135 P0141

A code P0135 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 wire harness. 
What to do; = 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)
A code P0141 may mean that one or more of the following has happened:

Same as above: mentioned in P0135.
What do do is the same as above, so i am leaning towards and faulty wire harness since you have replaced both O2 sensors. Make sure the wire harness has no break in it or crushed connection clips. The other thing to look for is a bad fuse that is used to heat up the O2 sensor. It may not say O2 sensor on it, it may piggy back off something else so check all the fuse and make sure the O2 has a good ground and not corroded. Good luck and hope this helps. 

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2 Answers

1996 s10 2.2 engine starts but idles rough and will not rev up.

Hi! You must be frustrated by now! your code is marking that the O2 sensor is bad in bank 1. Did you replace the O2 sensor that is located  before the catalytic converter?  The S10 has an O2 sensor specially made for that cat. its about 30$ That would explain for your blackened spark plugs; your pc on the car is asking for more fuel. GOOD LUCK!!

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