In Reply to: help with fault codes posted by mike on March 29, 1999 at 14:48:07:
I'm not sure, but maybe you're misinterpreting the flashes of the check engine light. Some of the codes do not make sense according to the Bentley manual (and Bonneville Motorwork's site). You'll get a .5 second flash after the codes which maybe you are interpreting as a 1 in the second code. I'm not sure if the codes are repeating (Bentley manual says the light goes off after all codes shown. I don't have any errors stored, but it seems my '89 and '95 kept repeating, meaning the Bentley is wrong.) If that's the case, you're getting 1222 repeating with a 1 indicating the end. Bonneville says Lambda #1 (How about a layman's description!?!)
The Bentley says "Oxygen Sensor Lean/Rich Control Stop". Haynes says "Oxygen sensor regulation"
Bentley Corrective Action is "Check for intake air leaks or reasons for rich mixture."
There are a lot of possible problems with the oxygen sensor or it's circuit. I don't have experience with this problem - but I'm putting my money on the sensor. Is your gas mileage suffering (mid-teens mpg)?
Best to get a Bentley, or the Haynes isn't too bad on this one either under "emissions and engine control systems". Maybe others can shed some light...
: last week my 90 535ia engine light came on and I could not get the car to go much faster than about 3 mph. After about 3 miles it cleared up and ran fine. (funny, that at the same time a noise that sounded like the driveshaft rubbing on a heat sheild also went away when it started running better).
: I looked at the fault codes via the check engine light and got these; 1222, 1122, 2112, 2211, and 2221.
: Does anyone know where I should start? From the bonneville mtr wrks site it may be the DME?, EGO sensor?, or Lambda Control #1?. So,,,, What's the next step?