2002 Monte Carlo 3.8 SS engine code
545

Asked by Allen Dec 01, 2021 at 10:17 PM about the 2002 Chevrolet Monte Carlo SS FWD

Question type: Maintenance & Repair

My Monte 3.8 had a PO118 CTS circuit
High so I replaced CTS erased code and
drove car. It ran good for 3 miles then
light came back on Temp gauge
stopped working again. Now  Running
rough..
Any ideas?

1 Answer
38,915

beatupchevy answered 2 years ago

The code may be from the thermostat not opening at the right temp. the other problem may be unrelated , buy AC Delco OEM part to avoid junk part as best you can . What do the plugs look like , is the spark good ?

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