Saturday, March 17, 2007

P0133 Code for 98 Saturn with 1.9L engine.


This car has a code P0133- 0xygen sensor signal slow and when I tested it using a voltmeter, I got 0.4 volt with key on engine off. When started and warmed up, the reading was fluctuating between 0.1 volt to 0.9volt as it should be. However, even after I changed the sensor, the code returns and got the SAME reading. Is this a computer problem?

ATS Adviser:

Before you condemn the computer, check the ground wire for the oxygen sensor located on the transmission mounting stud. If OK, I would check the oxygen sensor wirings at the ecm itself. There is a chance the wires could be open or shorted thereby givig you the code. If you still get the same readings, then you can also check the ground readings of the ecm and bring the same to the dealer for replacement or re-programming. ATS can provide you with the ecm wiring diagram so you can check all the pin voltage readings.


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