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2004 CHEVY PICKUP P0135 and P0155 O2 Sensor Fault - After Replacing Sensors Still Not Fixed

Model: CHEVY PICKUP Fault Code: P0135 Posted: 2014-12-25 19:45

I own a 2004 Chevrolet Pickup, and my truck is consistently throwing diagnostic trouble codes P0135 and P0155. I have already replaced both oxygen (O2) sensors, but the codes persist. The issue remains unresolved despite following standard troubleshooting steps. What could be causing this recurring fault? Are there any other potential causes or diagnostics I should consider?

Related fault codes

P0135P0155

Comments (3)

Anonymous 2014-12-26 10:07

Were the new O2 sensors purchased from the dealership or an aftermarket brand like O'Reilly Auto Parts?

Anonymous 2014-12-26 16:56

The sensors were bought from O'Reilly Auto Parts. I've never had issues with their parts, and they are likely of good quality. Still, could there be a deeper issue beyond the sensor itself?

Anonymous 2014-12-27 02:21

Have you checked the O2 heater fuse? Also, what engine size does your truck have? This may help narrow down potential causes.