OBD-II code · Powertrain (generic)
P0321 Ignition/Distributor Engine Speed Input Circuit Range/Performance
Engine speed input from the ignition/distributor is in electrical range but plausibility check fails — slow response, drift, or noise.
Is it safe to drive with P0321?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySensor drift or pickup gap wrong
- Less likelySensor element aged beyond calibration window
- Less likelySensor mounting loose - signal damping
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2.5 h
- Emissions test
- Likely to fail
- Parts involved
- Ignition Distributor
Related codes
- P0320Ignition/Distributor Engine Speed Input Circuit
- P031EIgnition D Control Signal Circuit Low
- P031FIgnition D Control Signal Circuit High
- P0322Ignition/Distributor Engine Speed Input Circuit No Signal
- P0323Ignition/Distributor Engine Speed Input Circuit Intermittent
- P0324Knock/Combustion Vibration Control System Error
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.