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| I scanned my pickup after the check engine light came on and I got codes P0156 O2 Sensor Circuit Malfunction and P0157 O2 Sensor Circuit Low Voltage. Has anyone had this problem with a Chevy before? I searched on Google and got several answers.. looks like a lot of guys rushed into replacing the 02 sensor and that was not it. Its a 2004 Chevrolet Half ton with the 5.3, and I just replaced the Cat's around 5-6000 miles ago. If anyone has any input that would be great! Oh yeah and I cleared them once already in the hopes that they would "disappear" and no such luck, the light came back on. Thanks in advance!
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2004 Chevrolet 1500 Engine Codes
