He got the SES light on, and 13mpg in his 92 SE. I told him it sounds like his O2 sensor. He got the codes, 13, and a bunch of 3'* and then 4'* (he'* kinda newbieish). The 13 is o2 sensor, open circuit. There is no 33, so that might be a different code, and 44 is exhaust lean. So I told him to get an AC DELCO ONLY sensor. I told him Bonnies don't agree with Bosch'*. He went to the parts store, they had both, and the AC was twice the price. So he called me back, wanting to get the Bosch. I had to convince him to get the Delco.
He had never replaced his O2. I told him if there was a Bosch in there, I'd be very suprised. He said if there was, he'd go back and get the Bosch and return the Delco. I told him that wouldn't be a good idea, but I don't know if he'll listen.