P1421 INFINITI, NISSAN: COLD START CONTROL
POST UPDATED IN May, 2023
P1421 INFINITI, NISSAN: COLD START CONTROL
The ECM (Engine Control Module) manages and regulates all the engine systems to achieve maximum engine performance. It handles some things such as the ignition timing and engine idle speed once the engine is started during warm-up conditions. This control activates the catalytic converter, which reduces emissions when it is warmed up.
On Nissan and Infiniti vehicles, the diagnostic code P1421 OBDII is stored when the Engine Control Module cannot properly control the ignition timing and idle speed when the engine is started under warm-up conditions.
Reasons why the P1421 OBD2 fault code is set:
Steps to solve the OBDII DTC P1421: