P0404 exhaust gas recirculation control circuit range/performance
p0137 02 circuit low voltage (bank 1, sensor 2)
I just replaced the 02 Sensor in front of the catalytic converter, but these codes continue to trigger my engine light. I think that the p0137 code is for the O2 sensor that's behind the catalytic converter, but I'm not 100% sure. Anyways, are these two codes related? Is this an electrical problem or do I need to replace my EGR and other O2 sensor? Does someone know the solution to this problem?
Note: It's a 1999 Saturn SL1, the website would not let me select the proper model year.
EGR circuit range/performance
Idle control system rpm higher than expected
How can I fix myself? Where can I find diagrams and repair instructions free?
Hey if you truely think it is your egr valve unhook it and if that is the problem then when it is unhooked it should run better and the codes should not come up. hey if you cahnged the 1 o2 sensor and not the other you probably made the code for the one u repalced come up again. i would recommened that you change both of the o2 sensors at the same time. try checking if your catalatic convert is plugged. how you do this is take a dollar bill and hold it at the end of your tail pipe while it is idleing and if the dollar bill stays still you have a plugged catalatic converter.
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All there is on the net in most cases are code definitions, u need a live data scan tool to see if these parts are defective or there are other issues causing, just because a certain sensor has a code DOES NOT MEAN IT IS DEFECTIVE.
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