12111, 12112

Since adaptation codes have extremely close tolerances, diagnostic trouble codes may be erroneously generated even though no faults actually exist. To avoid unnecessary and costly component replacement and fault diagnosis procedures, try clearing and zeroizing the functions in the LH control module.

If a diagnostic trouble code is generated even though a fault cannot be determined, try the tip given below (in certain cases it may even improve driveability).

Important: During the car's running-in period(up to 500 km), one or more of these diagnostic trouble codes may be generated even though no fault actually exists. In such case, carefully check whether the DTC is generated afresh after it has been cleared.


Diagnostic procedure

For diagnostic trouble codes 42441/22441 and 42451/22451, see point 1.

For diagnostic trouble codes 42442/22442 and 42452/22452, see point 2.

1 Check the induction system for leaks by listening for the sound of escaping air.

2 Check the fuel pressure and operation of the fuel pressure regulator.

Relative to the pressure in the intake manifold, fuel pressure should be:
-3.0 bar (all LH 2.4.2 except 9000T without cat.)
-2.5 bar (LH 2.4, 9000T)
-2.8 bar (LH 2.4.2, 9000T without cat.)
-3.0 bar (LH 2.4, 9000i)
If the fuel pressure is not OK, change the fuel pressure regulator.

3 Change the LH control module, see page 61

Useful tip: Run an extra ground lead from the oxygen sensor's outer casing (secured with a hose clip) to engine reference grounding point G7 on the lifting eye.