P0321

Ignition/Distributor Engine Speed Input Circuit Range/Performance

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Unstable engine operation
Misfires
Difficulty starting the engine
Power reduction
Increased fuel consumption

Causes

Faulty engine speed sensor
Open or short circuit in wiring harness
Bad contacts in connectors
Gear damage
Ignition module malfunction

How to Fix

Check the condition of the engine speed sensor
Inspect the wiring harness for damage
Check contacts in connectors
Test the sensor signal using an oscilloscope
Replace sensor if necessary

Related codes

P0300 P0301 P0302 P0325 P0335