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this shows info and repair for the p0526 its basically the fan clutch but on an envoy and trailblazers their electronic- prices vary but if this code popped up after changing plugs check the connections and harness for disconnect or damage ---recheck the plugs that the coil s are good and wires are on tight https://www.youtube.com/watch?v=UxwUvTiqtTA
your engine is misfiring according to your codes ...4 codes 4 problems P0300 - Random Cylinder Misfire DetectedP0301 - Cylinder 1 Misfire DetectedP0302 - P0312 Cylinder X Misfire DetectedP0325 - Knock Sensor 1 Circuit (Bank 1)Just showing a few
P1133 - O2S insufficient switching bank 1 sensor 1
go to autozone and have them read your vehicles computer ,,,or take your battery cables off for 10 minutes then put them on and see if it resets itself ...most likely a code misread on your vehicle
What code is popping up fo the service engine light? If you don't have a reader, take it to an Autozone or a place that will read this light for free. Let us know what the code is to help further, as without this, it could be many different things.
Leave 02 sensor alone ,it is doing it's job . It is heated up because of lean fuel mixture due to incorrect engine temp.,replace thermostat before looking further.
P1133 - Heated Oxygen Sensor (HO2S) Insufficient Switching Bank 1 Sensor 1 I would have the repair shop see if they either damaged or left disconnected the oxygen sensor for engine cylinder bank one upstream sensor, this sensor would have been disconnected if the oil pan was removed.
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