Why do they fail?

• Wear of internal resistive tracks due to constant movement
• Contamination from dirt, oil, or moisture ingress
• Electrical faults such as short circuits or poor connections
• Heat-related degradation over time within the engine bay
• Mechanical wear in associated throttle components
• Voltage irregularities affecting signal output

Symptoms of a faulty potentiometer

• Hesitation or jerky acceleration
• Poor throttle response or delayed engine reaction
• Engine entering limp mode
• Fluctuating or unstable idle speed
• Increased fuel consumption
• Illuminated engine management light
• Fault codes related to throttle position or correlation errors

Fitting tips

1. Always check for stored fault codes and confirm diagnosis before replacement
2. Inspect wiring and connectors for damage, corrosion, or poor contact
3. Ensure the throttle body is clean and free from carbon build-up before installation
4. Follow manufacturer procedures for alignment or calibration where required
5. Carry out ECU relearn or adaptation procedures after fitting
6. Clear fault codes and test drive to confirm correct operation