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Questions and Answers

Slow Chevrolet K1500 O2 Sensor

Q. I have a 1996 Chevrolet K1500 4x4, 5.7 liter, A/T. It has 88,000 miles. After clearing the Computer by disconnecting the battery. I am getting a service engine light after about 120 miles of driving. I have a friend that has an OBD-II scan tool. It stated I had a slow responding 02 sensor on Bank 1 pre-converter.

I replaced it myself with a new one ( aftermarket Bosch). I then cleared the codes. and the service light has reappeared. My questions are:

1. What will a slow responding sensor do to the computer, will it alter the trucks performance?

2.What may be the cause of this problem?

A. I'm assuming that the fault code is P0133 and that the DTCs P0131, P0132, P0134 and P0135 are not present.

The most likely cause of a slow responding HO2S is an exhaust leak near the HO2S. This dilutes the exhaust gas and it will not go across it's full range and set DTC P0133.

Another possibility is the Manifold Absolute Pressure (MAP) sensor being out of range and causing the fuel mixture to be either too rich or too lean, again causing the HO2S to not go through it's full range.

You will probably not notice any performance degradation, but the fuel economy will not be at it's best and the DTC will just keep resetting until the problem is corrected.

Additional Information provided courtesy of ALLDATA

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