emmission codes

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do u know what the code po121 means for 97 monte carlo 3.1 v6? or po420 on 98 merury sable?

Visitor

Jan 22, 2011

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What are the best Chevrolet repair shops?

RepairPal Certified shops can diagnose and repair your 1997 Chevrolet Monte Carlo. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.

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What is your question?

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emmission codes

What is your question?

do u know what the code po121 means for 97 monte carlo 3.1 v6? or po420 on 98 merury sable?

Visitor

in la Porte TX

Jan 22, 2011

1 Reply

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kwmkon Jan 27, 2011

The p0121 on the monte carlo is a throttle position fault. More testing would be needed to determine if the sensor is actually bad. The p0420 on the mercury is a catalytic converter fault. Most likely indicating the converter should be replaced.

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Popular Answer

What are the best Chevrolet repair shops?

RepairPal Certified shops can diagnose and repair your 1997 Chevrolet Monte Carlo. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.