P1221
Throttle Position Sensor 1- 2 Correlation
P1221 is an OBD-II diagnostic trouble code meaning: Throttle Position Sensor 1- 2 Correlation. Common causes: malfunction of one of the throttle position sensors, contamination or mechanical damage to the throttle valve. Estimated repair cost: $17–67.
Symptoms
- Rough engine idling
- Dips when pressing the gas pedal
- Check Engine light comes on
- Reduced engine power
- Increased fuel consumption
Causes
- Malfunction of one of the throttle position sensors
- Contamination or mechanical damage to the throttle valve
- Problems with wiring or sensor contacts
- Engine control unit malfunction
- ECU software error
How to Fix
- Check the resistance and output signals of both throttle position sensors
- Inspect the condition of the throttle valve and clean if necessary
- Check the integrity of the wiring and the quality of contacts
- If necessary, replace the faulty sensor
- Diagnose and reflash the ECU if a software error is suspected
Related codes
Error P1221 by Vehicle Brand
FAQ
What does the P1221 code mean?
P1221 is an OBD-II diagnostic trouble code that indicates: Throttle Position Sensor 1- 2 Correlation
What causes a P1221 error code?
The most common causes of P1221 include: Malfunction of one of the throttle position sensors; Contamination or mechanical damage to the throttle valve; Problems with wiring or sensor contacts; Engine control unit malfunction.
How do I fix a P1221 diagnostic trouble code?
To fix P1221: Check the resistance and output signals of both throttle position sensors. Inspect the condition of the throttle valve and clean if necessary. Check the integrity of the wiring and the quality of contacts. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P1221?
Limited driving only, diagnose soon
How much does it cost to fix P1221?
The estimated repair cost for P1221 is $17–67. Actual cost depends on your vehicle, location, and labor rates.
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