Check engine light on and off

230

Asked by Bub68 Jan 15, 2019 at 01:50 AM about the 2007 Chevrolet Silverado Classic 1500 2LS Crew Cab RWD

Question type: Maintenance & Repair

My truck check check engine light come on
for few days then if goes off for a few days.
The code the it shows is P0303 I change the
plugs and wires and also one of O2 sensor
but the code still shows up. I had a mechanic
look at it and he says there’s no vacuum
leaks and the truck
Is running fine. What can I do to get this fix

65,480

firebird338 answered 5 years ago

If you use the 87 octane gas all the time try using the 92 or 93 octane gas you will get better engine combustion and also clean the catalytic converter.

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Check engine light on and off

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