B1222: Fuel Temperature Sensor #1 Circuit Failure
MediumBodyBody Electronics
What does B1222 mean?
B1222 is a diagnostic trouble code indicating "Fuel Temperature Sensor #1 Circuit Failure". A sensor in the body electronics is reporting abnormal data or has lost communication with the ECU. Sensors can fail due to age, contamination, heat exposure, or wiring issues.
Symptoms you may notice
- Check engine light (MIL) illuminated on dashboard
- Poor fuel economy
- Rough idle
- Hesitation during acceleration
- Engine overheating
Estimated repair cost
Typical range in Australia (parts + labour)
$100 – $500 AUD
Common causes
- Faulty body electronics component
- Wiring or connector issue in the related circuit
- Failed sensor providing incorrect readings
- Software/calibration issue requiring ECU update
- Related component causing secondary fault
What should you do?
Schedule a diagnostic appointment at your earliest convenience. The vehicle is generally safe to drive short distances, but the underlying issue should be addressed to prevent it from worsening.
Get a diagnosis for YOUR car
Code B1222 can mean different things depending on your vehicle. TorqueBot gives you a diagnosis specific to your make, model, and year.