did autolite spark plugs screw up coil or coils ?? - Toyota Yaris Forums

04-09-2009, 03:07 PM

#21

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Drives: 2007 toyota yaris

Join Date: Mar 2009

Location: southern california

Posts: 87

Quote:

Originally Posted by YarisSedan

Well at this point if you only have p0420 then i would assume your coils are okay at this point. The missfire monitor on our cars are set as soon as the vehicle is started even if the battery has been disconected. So it would detect a missfire and set a code by now so i would no longer worry about the coil problem but the p0420 which is the catalist effiency below threshold code.

Exactly. and that is why this is so exciting to me.

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