emmission codes on 1997 Chevrolet Monte Carlo

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

by in La Porte, TX on January 22, 2011
1 answer
ANSWER by on January 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.
Related Items:
my monte carlo check engine light came on and it stayed on. i'm trying to figure out what is wrong because i had got my oil changed last sat on time and i keep the maintence up on my car.
we know where the knock sensor is...can't quite figure the best way (least invasive) to approach and replace it...have a diagram, but it's not helping....can you give us an A,B,C hint as to how to ...

Related Content