Question about Chevrolet Silverado 2500HD
MOF replaced light is on. PO 171 and PO 172
Posted by Anonymous on
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Posted on Jan 02, 2017
I have a ford 2003 windstar that was running very rough when cold and almost stalling. engine light came on. went to autozone and they read the codes for free and told me it was running lean on Bank 2 also. i came home searched for the O2 front sensors online using the info autozone gave me. there are 2 front sensors on my car that need to be replaced at the same time. look for ones that have a direct plug in and don't need wire splicing. the ones without the wiring harness are cheaper but more of a pain, i think.
they were fairly easy to replace. getting access with the wrench was the worst. reset the light by disconnecting the battery for a few minutes. seems fine now and the light hasn't come back on.
Posted on Jan 25, 2009
DTC P0171 and Po174 indicate air/fuel ratio is correcting rich for an overly lean condition. You could have several things causing this 1. fuel system malfuntion 2. EGR system malfunction 3. Air intake vacuum leak 4. Engine oil level to high 5. Incorrect cam timing 6. Restricted air cleaner 7. Faulty PCV system 8. Excessive internal engine wear.
Sorry I could not be more specific. Check for the easy things in this list. Most of the time one of the o2 sensors in bank one has failed and not reading correctly. Same on the 02 Lesabre.
Posted on Mar 01, 2009
There are 3 oxygen sensors on your van. Left bank would be the front left. Try replacing it and see if that helps but remember to reset the computer. Where I work the sensor costs a little over $100.00.
Posted on Mar 10, 2009
Yes, replace the MAF, then check if the lean condition goes away. It should.
MAF's are sensitive to cleaning. Sometimes it works, other times it doesn't.
Posted on Dec 11, 2009
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