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 Switch (535i, 735i & 735iL)
Throttle switch is located on intake manifold, opposite throttle linkage, below air intake hose to throttle body. Throttle switch determines throttle valve position. This information is converted into an electrical signal and is sent to the Microprocessor Control Unit (MCU). Switch incorporates idle switch and Wide Open Throttle (WOT) switch functions. MCU interprets signal as full throttle, idle or normal condition.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.
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