: P0300, p0301, p0302, p0303, p0189

12-17-10, 01:13 PM
My 2000 Catera has the check engine light on and has come up with the following codes: P0300, P0301, P0302, P0303, P0189, which are "random misfire, misfire cyl 1,2,3, and throttle position signal input.

Last week it had the code P0411 for air intake.

The mechanic is stumped, and thinks that it may be the computer throwing random codes.

I had the timing belt changed a few months ago. Ever since then, the car has not been running correctly and has been coming up with many error codes. The mechanic tried to "reprogram" the computer at that time, but said that he couldn't get it to reprogram. (That shop - the dealer - has since gone out of business, so now I am taking it to another shop.)

Please help.

12-19-10, 02:00 PM
timing belt not propely installed. bet money on. did the same thing 1st time i installed timing belt my self. got a new belt and did it right by the book. works great