P0189

Symptoms

• Unstable idle
• Increased fuel consumption
• Reduced engine power
• Difficulty starting the engine (especially in cold weather)
• Check Engine Light Illuminates

Causes

• Damage to fuel temperature sensor wiring harness B
• Poor connection or corrosion in sensor connectors
• Malfunction of the fuel temperature sensor B itself
• Circuit Grounding Problems
• ECU malfunction (rare)

How to Fix

1. Check the integrity of the fuel temperature sensor wiring harness B
2. Check the sensor and ECU connectors for corrosion or damage.
3. Test resistance of fuel temperature sensor B (compare with manufacturer specifications)
4. Check the reference voltage and grounding in the sensor circuit
5. If necessary, replace fuel temperature sensor B
6. Clear error codes and check if P0189 returns

Related codes

Error P0189 by Vehicle Brand