The check engine light came back on this past weekend.

Built-in reader:

Code 4: Air injection system faulty hot film mass air flow sensor with hot wire.

Code 19: Injectors circuit open or circuit short emission control module adaptation in engine control module at limit.


Pin 8:

Code 13: Idle speed control (ISC) system at upper or lower control stop or CC or EA indicates "limp home" mode.

Code 20: Self-adaptation at idle speed or upper/lower partial load at rich or lean limit.

Pin 14:

Code 2: EA/CC/ISC control module (N4/1) or Safety contact switch (M16/1s1) or Stop lamp switch or Cruise control switch or Actual value potentiometer or Starter lock-out/back-up lamp switch or engine speed signal or vehicle speed signal or closed throttle position switch or safety relay in EA/CC/ISC control module.

Code 5: Stop lamp switch (S9/1).

Code 11: Closed throttle recognition signal to engine control module (HFM-SFI or Left LH-SFI) Fuel safety shut-off to engine control module (HFM-SFI or left or right LH-SFI).


The car runs fine and the codes are now cleared. Both times the check engine light came on was during startup and stayed on through several start cycles until I cleared the codes.

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95 E320 Cabriolet, 169K