The P0189: Fuel Temperature Sensor B Circuit Intermittent refers to a problem within the fuel temperature sensor B circuit, indicating that the sensor is providing intermittent readings. This issue can result from various causes, such as a faulty sensor, loose or corroded wiring, or a malfunctioning Powertrain Control Module (PCM). In simple terms, when this code appears, it suggests that there is an unstable connection within the sensor circuit, which could lead to inconsistent fuel management and performance.
P0189 – Quick Overview
| Meaning | P0189: Fuel Temperature Sensor B Circuit Intermittent |
| Is it serious? | Yes, this code can be serious as intermittent sensor readings can lead to improper fuel management, resulting in unstable engine performance. |
| Possible causes | – Intermittent connection in the fuel temperature sensor circuit – Faulty fuel temperature sensor – Wiring or connector issues – Faulty PCM |
| How to diagnose? | – Inspect the fuel temperature sensor for intermittent operation. – Check wiring and connectors for loose or corroded contacts. – Perform a wiggle test to identify intermittent faults. – Replace or repair any faulty components. |
P0189 Meaning
The P0189: Fuel Temperature Sensor B Circuit Intermittent means that the sensor responsible for measuring fuel temperature is providing unstable or intermittent readings. This could be due to a faulty sensor, loose or corroded wiring, or an issue with the car’s computer (PCM). When this code shows up, it suggests that the sensor’s readings are not reliable, which could negatively affect your engine’s performance and fuel efficiency.
Step-by-step diagnostic guide
Follow the outline procedure to diagnose this DTC by eliminating possible causes one by one.
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check if there are any other related codes present. These might give additional clues about the problem. | OBD-II Scanner |
| Inspect the Fuel Temperature Sensor | Visually inspect the fuel temperature sensor for any signs of damage, corrosion, or disconnection. Ensure it is securely attached and operating correctly. | Flashlight, Safety Gloves |
| Check Wiring and Connectors | Carefully inspect the wiring and connectors leading to the sensor for any signs of loose or corroded contacts. Ensure all connections are secure. | Flashlight, Multimeter |
| Perform a Wiggle Test | While monitoring the sensor’s output, perform a wiggle test on the wiring and connectors to detect any intermittent faults. | OBD-II Scanner, Multimeter |
| Repair or Replace Damaged Wiring/Connectors | If any wiring or connectors are found to be loose, damaged, or corroded, repair or replace them. Ensure all connections are stable and free from dirt or corrosion. | Wire Strippers, Electrical Tape, Replacement Wires/Connectors |
| Check the PCM (Powertrain Control Module) | Inspect the PCM and its connections for any signs of damage or loose connections. If the PCM is suspected to be faulty, it may need reprogramming or replacement. | OBD-II Scanner, Multimeter |
| Clear the Code and Test Drive | After completing the necessary repairs, clear the P0189 code using the OBD-II scanner. Take the vehicle for a test drive to ensure the issue is resolved and the code does not return. | OBD-II Scanner, Vehicle Owner’s Manual |
| Recheck for Codes | After the test drive, re-scan the vehicle to ensure the P0189 code has not reappeared. If the code returns, further diagnosis may be required. | OBD-II Scanner |
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I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko