Have a p1133 code replaced all of the o2 and exhaust gaskets.
Hi there,
If replacing the O2 sensor hasn't solved the issue, it's possibly a wiring issue. Here is some info for you.
P1133 CHEVROLET - HO2S Insufficient Switching Bank 1 Sensor 1 Read more: https://www.autocodes.com/p1133_chevrolet.html
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