Error code

OBD2 P0186

OBD2P0186
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Fuel Temperature Sensor B Circuit Range/Performance.

Severity

moderateThe vehicle can be driven but may experience poor fuel economy and performance issues.

Summary

P0186 indicates that the fuel temperature sensor B is not performing within expected parameters, which can affect fuel injection accuracy and engine performance.

Symptoms

  • Poor fuel economy
  • Hard starting
  • Poor vehicle performance

Common Causes

  • Electrical short circuit or open circuit in wiring between ECM and FTS
  • Faulty fuel temperature sensor B
  • Water entry, corrosion, or wire harness damage affecting the FTS-ECM circuit

Diagnosis

  1. Use a digital volt-ohm meter (DVOM) to check the resistance of the FTS circuit
  2. Inspect for bent pins, corrosion, or water intrusion in connectors
  3. Test the fuel temperature sensor directly and compare its resistance with specifications

Fixes

  • Repair any wiring issues or replace faulty components

FAQ

What should I do if my car has P0186?

Start by checking the fuel temperature sensor B and its wiring for any signs of damage. If you find issues, repair or replace them as needed.

Can a bad fuel temperature sensor cause poor performance?

Yes, a malfunctioning fuel temperature sensor can lead to inaccurate fuel injection timing and affect engine performance.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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