Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Throttle Position (TP) Sensor
Mounted on throttle body at throttle plate rod, TP sensor monitors throttle plate opening. The TP sensor signal to PCM is proportional to throttle opening angle. The TP sensor signal affects air/fuel ratio, injector timing, idle speed, EGR flow and fuel pressure. If TP sensor system malfunctions, Code 12 will be set in PCM memory.
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Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.