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1999 GMC Jimmy 2 Wheel Drive had check engine light to come on, diagnostic code shown was 402 for a low emissions problem with the catalytic converter, catalytic converter was checked and there was no problem, is it possible an O2 sensor needs to be replaced? low mileage vehicle of 84,000 miles with regular maintenance, good condition, tune up recently done with new spark plugs, wires, distributor & cap, fuel filter, also the original converter was replaced 1 yr ago for a rattling sound. As far as I can tell, don't believe there is an engine coolant leak anywhere unless internally. Any suggestions on what could be wrong or what needs to be replaced?
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sounds like your tranny might be fried. Check the fluid on the dipstick on a paper towel if its black on the towel it might have gotten hot smell it for a burnt smell.
check fuse and relay to switch if power to switch retest switch new doesnt mean not defective if no power check connections and wiring for damage or breaks
DTC P0402 means that the OBD has detected a excessive amount of egr gases in the system.
The EGR system has three major parts in it, The EGR valve, an actuator solenoid, and a differential pressure sensor (DPF).
P0402 was triggered by one of the following,
The DPF is faulty and needs to be replaced.
There is a blockage in theEGR valve from carbon build up and needs to be cleaned or replaced.
The EGR valve is faulty
Lack of vacuum to the EGR to opperate properly.
Most will clean the EGR valve and if that does not fix the problem, check the connection to the DPF and or replace the DPF.
Good luck and keep me posted. be glad to help.
Check the fuel pump pressure. should be between 60 to 66 psi. There isn't an easy answer for this one. You may need to perform component testing and a diagnostic check.
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