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Would a secondary O2 sensor see a race header as a faulty cat?
My check engine light is on with a code P0139. I have checked the wiring, replaced the O2 sensor and put a non fouler/ check engine light eliminator in the secondary O2 bung.

How do I trouble shoot the problem.

the gauge for battery reads from 10-14. the battery terminals are clean, and tight. The alternator test good

Car is making a whining noise when i turn the wheels. getting harder to turn, noise getting louder.

When I slow down.

I want to replace the wheel cylinders on the rear is it difficult

the car is a 4cyl

replaced. I don't know if these are connected or not. What's going on?

I CHANGED THE EVAP PRESSURE SENSOR ABOUT A MONTH AGO
, AS WELL AS THE FUEL PUMP AND FILTER

the ac drain is not blocked water drips from somewhere above the ac evaporator behind the glove box

I need to know because my car is over heating so im replacing my radiator because i found a leak in it i also found a hoes that is under the air filter but have no idea where it goes

Service Engine Soon on all the time

no problems up to now

we bought it that way.

sometimes thats to hard to do.