Engine Error
P0721
Output Speed Sensor Circuit Range/Performance
Severity
Medium
Symptoms
Erratic speedometer, poor shifting, harsh engagement
Common Causes
- Metal shavings on Output Speed Sensor (OSS)
- Failing OSS sensor
- Damaged sensor reluctor wheel
- Contaminated transmission fluid
How to Fix
- 1 Remove and clean OSS sensor
- 2 Replace OSS sensor
- 3 Flush transmission fluid
- 4 Inspect and replace reluctor wheel (requires teardown)
Estimated Repair Cost
USD
$50
–
$300
OSS Sensor replacement: $100 - $300