1996 Pontiac Grand Am Codes P0172 and P0141

PDONOVAN821

MEMBER
1996 PONTIAC GRAND AM
4 CYL
2WD
MANUAL
157,000 MILES

I have a 96 Grand Am SE throwing two codes when hooked to a hand held reader. The first is P0172, which is a fuel trim condition (the car is running rich judging from the sound of the engine and the exhaust). This code, according to the readout it says to suspect the Mass Air Flow Sensor if bank one and two O2 sensors code together. The second code, P0141, states that there's an issue with the Bank 1 Sensor 2. My question is this, should I suspect the Mass Air Flow sensor, or the oxygen sensor, or something else that the computer isn't picking up on that's causing it to run rich, and if so where and how does one go about fixing this.

3 Replies

KSCMAC

MEMBER
3 POSTS

Use a cleaner to clean the throttle/airbody, clean(very very carefully!) The mass air flow sensor. Use Lucas fuel/injector cleaner. I know trhis stuff works! I had a 1996 Hombre with a clogged cat, cleaned out cat. The computer only triggered once on 02 sensors when I forgot to add lucas to my fillup, after about 55 miles check engine light came on(have a code reader) put in lucas and after about 130 miles check engine light went out! Ru a couple of tanks with the lucas to clean out the system as well as the cleaning the air system. It should stop the engine check light and does not cost much to do.

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Thursday, April 4th, 2013 AT 10:02 PM

HMAC300

MECHANIC
48,601 POSTS

If it doesnt' say expert by the name it'snot from 2carpros. Check your fuel pressure first either the regulator isn't working correctly or a vacuum leak to reg if operated by vacuum or low pressure.

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Saturday, April 20th, 2013 AT 8:27 AM

KSCMAC

MEMBER
3 POSTS

There are several small rubber vacuum hoses that get cracks and the MAP sensor uses some plastic vacuum lines and these can leak and with a lot of miles or age best to replace them. You can find that there are no leaks but durring engine operation with heat building up can start to leak. I thought my pressure regulator was bad but it was the vacuum line going to the MAP sensor, I had the use a plastice zip tie to keep the MAP sensor an lines together and it has worked fine now for over 4 years.

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Saturday, April 20th, 2013 AT 11:27 AM