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97 GMC: van..cyl..Service Engine Soon light came

Customer Question
I have a 97 GMC...
I have a 97 GMC Savana van with the 5.0 8 cyl engine. The "Service Engine Soon" light came on and I brought it in for service. The 2 oxygen sensors were changed and the error codes reset. The "Service Engine Soon" came on again after 40 plus miles. Error code showed oxygen sensors again. The two sensors were replaced again and error code reset. Lasted about 45 miles and the light came on again. The sensors were checked and found to be OK. I replaced the fuel cap and the light remained off for 2000 plus miles. When I had the radiator replaced and the air compressor replaced the "Service Engine Soon" light returned. Showed sensors were bad but they were checked out and found to be working. Any ideas?
Submitted: 8 years ago.Category: GM
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6/18/2010
GM Mechanic: Ron Z., - GMC Tech - replied 8 years ago
Ron Z.
Ron Z., - GMC Tech -
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Satisfied Customers: 20,055
Experience: 18+yrs experience. State Inspector & GM Diagnostics/Repair
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Can you give me the actual "p-code" that is retrieved?

 

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Customer reply replied 8 years ago

The initial trouble code was P0153/P1153. Oxygen Sensor slow response. Bank#2/sensor #1

GM Mechanic: Ron Z., - GMC Tech - replied 8 years ago

 

On more question- can you give me the location of the O2 sensor(s) that were replaced?

 

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Customer reply replied 8 years ago
All I have on the work order is Bank#2/Sensor #1 with a part number of ACDAFS105
GM Mechanic: Ron Z., - GMC Tech - replied 8 years ago

 

I see. What i'm trying to do is verify the correct sensor was replaced. There are 4 Oxygen Sensors on this vehicle. If the wrong one was replaced, this will cause the issue you are having.

 

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Customer reply replied 8 years ago
The shop changed the driver side sensor before the catalytic converter and the sensor on the right side of the vehicle. That is the only info. on the work order.
GM Mechanic: Ron Z., - GMC Tech - replied 8 years ago

 

Ok. The one that should have been changed in association with this code is the Oxygen Sensor on the passenger's side, before the converter. If this is the one that was changed for sure, we must next move onto voltages and grounds (as long as the current code in the computer is still P0153/1153).

 

Check for blown fuses in the fuse box (#11, but check them all while you are there). Next the grounds at the PCM connections will need to be checked. If these check you will need a scan-tool to diagnose this further, as it may come down to a faulty VCM (aka PCM aka on-board computer). Below i have attached the GM diagnostic flow chart for this issue:

 

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Ron Z.
Ron Z., - GMC Tech -
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Satisfied Customers: 20,055
Experience: 18+yrs experience. State Inspector & GM Diagnostics/Repair
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Customer reply replied 8 years ago

Which air flow sensor needs replacement? I see there are two: afs106 & afs105. The 106 is closest to the converter with the second about 9 inches closer to the front of the vehicle. Thank you again.

GM Mechanic: Ron Z., - GMC Tech - replied 8 years ago

 

It's not an airflow sensor, its an oxygen sensor. It will be on the passengers side, mounted into the exhaust. closest to the engine. I do not have access to "part store" part numbers, just OEM. Most part stores can "cross over" OEM to aftermarket. The OEM # XXXXX: 25312200.

graphic

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