Question about 2002 Pontiac Grand Am
Yes there is a way to test the cat take out the oxygen sensor right in front of the cat and start the car if it runs fine then your cat is plugged what you are doing is opening the exhaust so it can breath hope this helps
Posted on Jan 25, 2014
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Posted on Jan 02, 2017
check your Temp sensor for the ecu. could be out of spec at lower temps but not enough to send a code "You know -40 is possible and won't send a code"
Posted on Nov 12, 2008
SOURCE: 1998 PONTIAC SUNFIRE ADVISE
Exhaust Gas Recirculation System Is the main problem here. the other code P0118 may be a bad temprature sensor or your thermostate needs to be changed. Last it could be a weak water pump.
So what is an EGR system and how does it work? EGR stands for Exhaust Gas Recirculation, and as its name implies, this system allows exhaust gasses from your car to be re-circulated into the engine, helping to reduce emissions. These systems are mostly comprised of the EGR valve, a DPFE (Delta Pressure Feedback EGR) sensor, hoses, a vacuum regulator, some vacuum lines, wiring, the computer and the exhaust tube leading to the valve itself.
The car's wiring can be tested in the normal fashion by looking for broken and lose wire, and all vacuum lines can be checked easily for cracks, leaks and correct routing.
The last thing i would then check is the the EGR valve, EGR vacuum regulator and DPFE sensor (or similar flow sensor).
I hope this helps and good luck
Posted on Apr 09, 2009
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