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Posted on Jan 02, 2017
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
yes and also may make it run rough or lack power. the o2 sensors tell the computer how to make the engine run
Posted on Feb 13, 2010
Testimonial: "u said it would make it hard to start and the other tech said he doesnt think so"
SOURCE: CODES P0031 AND P0051 A/F
You will need wiring diagrams, to find components
and diagnose the problem
You have 2 O2 Sensor Codes-- for Heater issues
I would look for an O2 Relay, for the heaters, once
you have a diagram to work with
Battery voltage will be to the heaters only
Don't put your meter on the black sensor
wire, you may ruin the sensor, by loading the circuit
Just work the 2 white heater wires on chassis
side, for the 12 v
Unplug the O2 Sensors, and probe the harness heater
wires only, until you get your 12v back
Posted on Feb 23, 2011
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