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1997 Chevrolet Chev Motorhome (P-32 Chassis) with P0131 and P0134 O2 Sensor Codes After One Hour of Driving

Model: 97 Chev Fault Code: P0131 Posted: 2009-09-21 14:36

I own a 1997 Chevrolet Chev Motorhome built on a P-32 chassis, equipped with a 454 engine. After driving approximately one hour, the vehicle triggers trouble codes P0131 and P0134 consistently—like a clock. I currently have a scangauge installed, which shows that if I reset the system, the code will remain off for about 10 minutes before reappearing. If no reset occurs within another hour, both P0131 and P0134 appear simultaneously. During trips, if I stop every 45 minutes, shut down the engine, wait 10 minutes, then restart, the codes do not trigger—indicating a possible temperature-related behavior. I understand that P0131 is a Bank 1 Sensor 1 O2 sensor low voltage or inactivity fault. My questions are: - Does this point to a faulty oxygen (O2) sensor? - Why does the code only appear after one hour of driving? - What diagnostic checks should I perform before replacing any components? - Where is the Bank 1 Sensor 1 O2 sensor located? I have frozen data available if needed. Any insights would be greatly appreciated.

Related fault codes

P0131P0134

Comments (3)

Anonymous 2009-09-22 06:50

Given the age of your vehicle, a defective oxygen (O2) sensor is likely the root cause. The Powertrain Control Module (PCM) performs system checks every time you start the engine. These checks take time to complete, and when a fault is detected, the Check Engine Light (CEL) activates. Resetting the PCM clears the stored codes but also resets its memory, forcing it to re-run the diagnostic checks. Before replacing the O2 sensor, verify wiring and connector integrity—check for proper voltage, ground connection, continuity, and insulation issues. The Bank 1 Sensor 1 O2 sensor is located on the driver's side of the vehicle, between the exhaust manifold and the catalytic converter. If you replace it, consider using an OEM part from your dealership. Aftermarket sensors may not be fully compatible with the original PCM, leading to repeated failures and costly replacements. Best of luck—please update us if you find a resolution.

Anonymous 2009-09-22 19:46

Thanks for the insight! I'll perform a thorough inspection of the wiring harness and connectors, checking voltage, ground, and continuity. Hopefully, this will help identify any intermittent faults. Any thoughts on why the code only appears after one hour of driving? And why it doesn't trigger when I stop every 45 minutes and restart?

Anonymous 2009-09-23 05:15

It's possible that the sensor remains within a stable temperature range for less than 45 minutes, so the PCM doesn’t detect an issue. After about one hour of driving, the sensor heats up and may enter an open-loop state—causing the fault code to appear. As Mohawk mentioned, a defective O2 sensor is most likely the cause. If it were a wiring issue, I’d expect the failure to be permanent once triggered. A temporary or intermittent signal would suggest a failing sensor rather than a broken wire.