Advanced Auto, says GMC is throwing P0135 PO155 & P0300 codes.
09-11-2018, 06:33 PM
#1
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Advanced Auto, says GMC is throwing P0135 PO155 & P0300 codes. Its a 2000 GMC Safari with over 500,000 miles (used in a pilot car business). Ran great, lots of work in it. The it suddenly began running rough. Mechanic says it needs a new engine. But it doesn't run like it. According to the codes it may need 2 sensors and that there is misfiring.
Any ideas before this great vehicle is scrapped for parts? It's been well taken care of and runs even better at a faster speed. I say check all that you would in a major tuneup to see if that fixes it...after you replace the O2 sensors.
Any different ideas?
Any ideas before this great vehicle is scrapped for parts? It's been well taken care of and runs even better at a faster speed. I say check all that you would in a major tuneup to see if that fixes it...after you replace the O2 sensors.
Any different ideas?
09-11-2018, 10:24 PM
#3
Did the mechanic say WHY it needs a new engine? Did he do additional troubleshooting to come to that conclusion? Compression and/or leak down test? Replacing the usual wear parts is normally a safe bet, but if there’s more to the story it would be good to know up front. Low/no compression would change the way I approach the repair and the P0300 is a bit concerning based on mileage. You may opt to not buy new 02 sensors if the misfire is from engine wear.
