I failed mine because the gas cap failed and I never got a check engine light or any codes. I got a print out as to why it failed. Why are you not giving us more details?
Have the fault codes read on a scan tool capable of reading GM protocol
check engine lights are for major problems in engine and transmission
SOURCE: check engine light/2003 toyota CE
your car engine may have some hidden problem, suggest you take it to dealer workshop to have you car ECU scan and it will resolve the problem once and for all.
SOURCE: wont complete scan to pass emission test
When you rest your codes there is a series of tests your ECU has to go through before you can pass emissions. this is done some people can reset the code and go before its sets the code again. on the 96 you can have 2 tests not complete for it to pass. basicly you have to drive the car a couple days for the tests to pass.
check the readiness tests wait until only 2 have not passed. then you should be good.so drive and check.
Michael
ASE certified
PLZ rate.
SOURCE: 1996 doge intrepid wont pass emission test because IM monitors ar
Just maybe your O2 sensors are not operating properly. They may be requiring your engine to heat them up to get upper temperature readings but not lower. You can easily diagnose these and all other sensors and problems by purchasing a Hains manual at your local Auto Zone or Advance auto store which will greatly aide you in diagnosing all your auto needs. And the fault symptom index at the beginning of the book will ease your troubles with professional one on one advice with step by step instructions. Its like having your own ASE certified mechanic at your finger tips. Good luck.
SOURCE: I have a 2001 Saturn. It failed emissions because
Go get your engine fixed at Jiffy...........You know they got a sale right???
SOURCE: FAILED EMISSIONS TEST P0401&P0420 CHECK
P0401 indicates that the Exhaust Gas Recirculation Flow Insufficient Detected. This can be because EGR is faulty . As you have replaced this then the problem must be with the vacuum line . EGR valve vacuum line which can be broken or blocked. The vacumn ine must bbe checked for leaks or any blocks using an vacumn pump connected the line.
P0420 indicates that the down stream oxygen sensor reading is not steady and it is connected with the code P0401.
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