P0189 Code - Fuel Temperature Sensor 'B' Circuit Intermittent
Quick Answer
The P0189 code indicates a problem with the fuel temperature sensor 'B' circuit in the vehicle. Common causes include Faulty fuel temperature sensor, Damaged wiring or connectors in the sensor circuit, Corrosion or poor connections in the sensor circuit. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0189 indicates Fuel Temperature Sensor 'B' Circuit Intermittent.
- Common causes
- Common causes include Faulty fuel temperature sensor, Damaged wiring or connectors in the sensor circuit, Corrosion or poor connections in the sensor circuit.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code P0189 Description
The P0189 code indicates a problem with the fuel temperature sensor 'B' circuit in the vehicle. This sensor is responsible for measuring the temperature of the fuel in the fuel tank and transmitting this information to the engine control module (ECM). The ECM uses this data to adjust the air-fuel mixture for optimal combustion. When this sensor circuit is intermittent, it means that there is a fluctuation or inconsistency in the signal being sent to the ECM.
Common Causes of P0189
- Faulty fuel temperature sensor
- Damaged wiring or connectors in the sensor circuit
- Corrosion or poor connections in the sensor circuit
- ECM issues or malfunctions
- Environmental factors such as extreme temperatures affecting the sensor's performance
Symptoms of P0189
- Decreased fuel efficiency
- Rough idling
- Hesitation or stalling during acceleration
- Engine misfires
- Check Engine Light illuminated
How to Fix P0189
- Diagnose the issue by using a scan tool to retrieve the trouble code and perform a visual inspection of the sensor, wiring, and connectors.
- Test the fuel temperature sensor using a multimeter to check for proper resistance values and functionality.
- Inspect the wiring and connectors for any damage, corrosion, or poor connections and repair or replace as needed.
- Clear the trouble code from the ECM's memory and reset the system to see if the issue reoccurs.
- If the problem persists, consider replacing the fuel temperature sensor or seeking further diagnostics from a professional technician.
Cost to Fix P0189
The typical repair costs for addressing a P0189 code can vary depending on the specific cause of the issue and the vehicle make and model. In general, replacing a faulty fuel temperature sensor can cost between $100 to $200 for the part alone. Labor costs can range from $80 to $150 per hour, and the total repair bill may amount to $200 to $400 or more, including parts and labor. It's advisable to consult with a trusted auto repair shop for a more accurate estimate based on your vehicle's specific needs and location.
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Code P0189 Information for Specific Makes
- P0189 Mazda — Fuel Temperature Sensor B Circuit Intermittent
- P0189 Mercedes-Benz — Fuel Temperature Sensor 'B' Circuit Intermittent
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