Question about 2003 Chevrolet Impala
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Posted on Jan 02, 2017
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.
Posted on Feb 09, 2009
You may have a defective coolant or air temp sensor. These need to be accurate in order for some of the monitors to run. Your going to need a diagnostic scanner to see the data so you can determine what is wrong.
If you had replaced or unhooked the battery just pryor to geting the smog then thats the problem. Just drive the truck for a couple days and you should be fine.
You will still pass the test if you still have 2 monitors not set. California allows that. 3 fail
Posted on Feb 18, 2010
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