What does code P1404 mean?

Q: What does code P1404 mean?

Heated Catalyst Current Too High During Heating Bank 2. P1404 on BMW vehicles means the engine control module (ECM) has detected that the electrical current drawn by the bank 2 heated catalytic converter is higher than expected during its heating phase. The ECM monitors this current to ensure the catalyst reaches operating temperature quickly, and an excessively high reading points to a short circuit or a failing heating element.

DTC codes / BMW codes / P1404

P1404 · BMWHeated Catalyst Current Too High During Heating Bank 2

P1404 on BMW vehicles means the engine control module (ECM) has detected that the electrical current drawn by the bank 2 heated catalytic converter is higher than expected during its heating phase. The ECM monitors this current to ensure the catalyst reaches operating temperature quickly, and an excessively high reading points to a short circuit or a failing heating element.

SystemPowertrain

Code typeBMW specific

SeverityMedium

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.