What does code P1466 mean?

P1466 · BMWHeated Catalyst Power Switch Temperature Sensor Plausibility

P1466 on BMW vehicles indicates the engine control module (DME) has detected an implausible signal from the temperature sensor integrated into the heated catalyst power switch circuit. The computer compares this temperature reading against other engine parameters and flags the code when the value falls outside the expected range or behaves erratically, pointing to a fault in the heated catalyst monitoring system.

SystemPowertrain

Code typeBMW specific

SeverityLow

Fix difficultyIntermediate

AreaAuxiliary emission controls

Guidance is general and written for BMW vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.