Question about 2000 Chevrolet Silverado 1500

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My 2000 Chevy Silverado has trouble code P1133.

I have checked for lose and broken wires, diconnected vaccum lines but have not found any problem, could the senser be bad ?

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Some cars do have recalls for bad codes being thrown check your dealership and if theres no problem they can block the code so your engine light will not come on for that code

Posted on Jun 30, 2009

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I just got the same code, the kid at advance auto told me it's the "Mass Air Flow Sensor". On our truck it's right before the air filter box and has a 4 wire plug on it. It's a collar shaped sensor right after black flex hose. Take it out and clean the 3 little sensors on the wires inside. They look like little diodes. Use isopropyl (rubbing) alcohol or MAF (contact) cleaner. If you're lucky you won't have to buy a new one, because they're like 100 bucks.

Posted on Aug 06, 2009

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