I have a P0405 code where is it located and how do I fix clean or replace it
Betty, Check the attached EGR links,instruction and guides, Good luck
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Exhaust Gas Recirculation Valve EGR Checking
Faulty EGR Valve Symptoms and EGR Valve Cleaning
EGR Valve Replacement Chevy Venture 3 4L Engine
Installing New EGR Valve
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
SOURCE: 1999 Firebird SES Codes P0420 and P1404
It can be related. Was this a real highflow like a maganaflow or catco or was it one of the straight through designs? if you can see through it, even if it is marketed as a cat, it isnt.
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