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Re: My tahoe wont pass emissions test, because of the...
True it wont because it is part of the emissions system and when bad sets off check engine light which alone fails a vehicle gm v8 have two knock sensors which sad to say are under the intake manifold
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This code relates to the knock sensor circuit. Replace the sensor and the light will go out. This will allow the engine to pass the emissions test.
Hope this helps...
Codes do not tell you what to replace
They only tell you that a malfunction occured
Does not mean anything need replacing
Example: if you got an O2 Sensor code from a loose
vacuum hose ,would you change the sensor.
Most people would. I would diagnose and repair the hose,
letting in the extra oxy and leaning out my sensor.
Turn ignition off. Disconnect knock sensor 3 - pin harness connector. Locate knock sensor, on cyli nder block. On Optima 2.7L engine, sensors are located on both sides of cylinder block. . Remove knock sensor from cylinder block. To install, reverse rem oval procedure.
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.
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.
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