Question about 1995 GMC Sierra C1500
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Posted on Jan 02, 2017
SOURCE: 02 sensors not ready
The code P0420 indicates that the catalytic converter is not functioning efficiently. This could be because the cat is damaged or the engine is not running very well and the cat cannot keep up with the emissions. You should ensure that the spark plugs and ignition components are in top shape before replacing anything else. If a compression check reveals a low cylinder, you will not be able to prevent this code as even a new cat cannot keep up with a dead miss. If the state of tune and the compression is good, then you'll likely need a cat.
I've posted the drive cycle just so you know what to do when you have resolved the code.
Do not leave the key in prior to the cold start or the heated oxygen sensor diagnostic may not run.
Posted on May 14, 2009
the best place to look is actually on the back of the fuse cover it should have a diagram of the fuses and say what each fuse goes to and what size fuse it is
Posted on May 14, 2009
It is located on top of the heater box in the passenger side remove the glove box to gain acess there are two 7mm srews and a relay braket holding it in place it is a tight squeeze but can be removed with a 1/4 inch ratchet.
Posted on Aug 01, 2009
I had to change the blower motor, turns out the spring tension on the brushes on the motor were too tight and ate into the brass commutator of my old motor.
Posted on Sep 17, 2010
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