P0137 OBD2 Code on 2000 Chevrolet Silverado 1500: Sensor Replacement and Air Leak Fixes Not Resolving Issue
I recently noticed the service light coming on my 2000 Chevrolet Silverado 1500, which indicated a low voltage reading from the O2 sensor (Bank 1, Sensor 2). I replaced the oxygen sensor as recommended, but the check engine light remains on. I also identified and repaired potential air leaks near the sensor area, yet the issue persists. The fault code P0137 is still present. Given that two of the four common troubleshooting steps have been completed (sensor replacement and air leak repair), what could be causing this persistent problem? Any insights or suggestions for further diagnosis would be greatly appreciated.
Refer to the OBD2 trouble code database in this forum for detailed causes and solutions. You've addressed two of the four standard troubleshooting steps—replacing the oxygen sensor and fixing air leaks. The remaining possibilities are faulty circuit wiring or a clogged catalytic converter, both of which should be inspected if the P0137 code persists.