If someone could translate....1995 960 error code 512 oxygen integrator max lean running limit...ok so in English and how do I fix the problem. already have new plugs, MAF, and Catalytic converter. thanks for any info.

 

5-1-2 Short Term Fuel Trim (Integrator), Lower Limit
Condition(s) for DTC
The short term fuel trim value is a measure of degree to which the injection period in the basic MFI module program must be varied to ensure that the engine is supplied with the optimum air/fuel mixture. This optimum mixture corresponds to a value of Lambda = 1 . If the engine is running rich, the short term fuel trim will reduce the injection period to restore the optimum mixture. A DTC will be recorded if the engine runs so rich that the short term fuel trim reaches its lower limit and remains there for 166 seconds .
Fault source(s)

• Heated Oxygen Sensor (HO2S ) signal lead short-circuited to ground.
• HO2S faulty.
• Contact resistance and oxidation in Mass Air Flow (MAF) sensor connector.
• MAF sensor faulty.

 

If you have checked all of your electrical connections/sensors as Henry suggested, I will bet you have an intake leak, somewhere after the MAF.

Check the rubber ducting, the flame trap, the oil separator, also check the foil pipe to the air filter. The door valve at the bottom of the air filter box could be stuck permanently to drawing hot air from the exhaust manifold. Also the intake gasket could be the cause.

While the book will suggest certain sensors for a code, the code is just a clue, so one must rule out physical reasons, such as an air leak or electrical oxidation, a slipped pin in a connector first.

DanR '94 964 386,000 miles (152,000 on the new engine)