Quote:
Originally Posted by Clodfobble
Fuck. Check engine light is on. Got the codes read at AutoZone, they say:
P0421 - Warm up catalyst system (RH) efficiency below threshold
P0431 - Warm up catalyst system (LH) efficiency below threshold
P0174 - Lean Air/Fuel ratio bank 2
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I'm replying based on experience, not on knowledge.
Before panic, try filling the tank with "good" gas... not higher octane, but from a trusted gas station.
Be sure the cap in on tightly, as it should be
Try driving thru this first and maybe second tank of gas to see if the light goes out, and or the codes disappear.
This experience did happen with my grandson's Subaru, and the new gas did the job.
Best of luck...