P1149 Diagnostic Trouble Code (5 interpretations)

The control module detected that the Alternator 2 signal stayed above the expected range. This is the manufacturer-specific definition used by Ford.

The control module judged the Heated oxygen sensor (HO2S) - front behaviour implausible for the current operating conditions. This is the manufacturer-specific definition used by Honda.

The control module detected improper operation of the Manifold absolute pressure (MAP) sensor(s). This is the manufacturer-specific definition used by Mercedes-Benz.

The control module detected a short circuit to ground in the Variable timing electrovalve circuit. Documented for the Magneti Marelli MM6KP engine ECU (EW7A/EW10A) on Peugeot applications; the same PSA control units are also fitted to Citroën models.

The control module detected a fault associated with the Heated oxygen sensor (HO2S) 1, Bank 1 - implausible lambda control value circuit or function; the stored code identifies the affected component rather than a single failure mode. This is the manufacturer-specific definition used by Audi.