With Integrated Fault-Diagnosis System (Flash Codes): 12225

12225

CHECK ENGINE
Off

Malunfction Indicated
Lambda sensor, signal faulty or preheating defective (engine temp must be above 70°C; M88: 80°C).

Preliminary Action
Check voltage present across pins of Lambda sensor connector.
Check preheater fuse (M88: also that line-fuse connector making good contact). Check that Lambda signal ranges between 0 and 1.5 V (sensor hot). Fit a new Lambda sensor. Try a known good ECU.