Could a bad rear O2 sensor cause my car to run at 18 volts? I have tried everything, replaced Battery, altenator and voltage regulator and still having same problem.

I need serious help, asked all my car buddies for help on this and no luck.

 

is that 18v the reading on your guage on the instrument panel?. maybe its faulty if its the only thing reading 18v. Use a DMM or something to test it, see if you get a different reading. I figure running at 18v. you'd be fryin things alot, like your battery.

 

haven't checked the guade yet, but yes that is where I am reading it from. How would I go about testing the volatge? Just go off the battery?

Thanks

 

yeah, just use a DMM across the battery, see what voltage you get there.