Check Engine light when AC runs about an hour/ error code P0741

Asked by Sep 21, 2016 at 04:08 PM about the 2007 Toyota Corolla S

Question type: Maintenance & Repair

Last summer and this one, when I do about an hour drive with the AC on the
check engine light pops on. End of summer light turns off when I stop using
the AC.  Error code P0741.

Firestone said car seems fine.  should I do anything else?  Mileage 89,000

1 Answer

i'm writing my own answer in hopes of helping someone else. There was a transmission place next to the place I'm getting my brakes done. They took my car out for about an hour with their machine and diagnosed transmission brushes and bearing. They said I did not need to do anything the car will not fail it won't break the transmission. The only down side is the check engine light will be on and I can't pass the california smog test. the charge to fix is $1300. There's an official smog next to the transmission place. They said don't turn on the AC, try to get the light off when I bring it in. If it passes the other tests my car will pass because they know the transmission shop owner.

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