Description
Overview
High-quality throttle body designed for PSA (Citroën and Peugeot) 1.8 and 2.0 petrol engines. Compatible with part numbers 1635R4 and 1635V1. This unit is intended for professional workshops and experienced DIYers who need a reliable replacement to restore throttle response, idle stability and correct air intake control.
Function
The throttle body regulates the volume of air entering the engine intake. It typically houses the throttle plate and associated sensors, such as the throttle position sensor and, depending on variant, an idle control actuator. Proper operation is essential for smooth acceleration, consistent idle and accurate air-fuel mixture control.
Compatibility & Application
Engine compatibility: Petrol 1.8i, 1.8 16V and 2.0i, 2.0 16V engines from the PSA family fitted to Citroën and Peugeot models. Always confirm fitment by checking the vehicle VIN or matching the product codes 1635R4 / 1635V1 with your vehicle parts list before purchase.
Replacement Notes
Typical replacement procedure: disconnect the negative battery terminal, remove the intake hose and airbox connections, unplug the electrical connector(s), unbolt the throttle body from the intake manifold, replace the gasket if required and install the new unit. Reconnect electrical and intake connections and perform any required throttle adaptation or relearn procedure specified by the vehicle manufacturer. Follow safety recommendations and the manufacturer’s torque specifications for the mounting bolts.
Common Failure Modes
Throttle bodies commonly fail due to carbon build-up, contamination from EGR and crankcase vapors, or wear/failure of integrated sensors and actuators. Typical symptoms include rough or fluctuating idle, reduced engine power, delayed or inconsistent throttle response, warning lights on the dashboard or activation of limp-home mode. Addressing intake contamination and ensuring proper electrical connections can prevent many issues.
Maintenance Advice
Inspect and clean the throttle body during scheduled maintenance or when driveability issues arise. Cleaning intervals depend on driving conditions; a useful guideline is to inspect around every 60,000–100,000 km. Use appropriate throttle-body cleaners and avoid damaging sensors or the throttle plate mechanism. After cleaning or replacement, a throttle relearn or idle adaptation may be necessary on some vehicles.
Technical Information
- Manufacturer: PSA Citroën Peugeot
- Model: Petrol 1.8i / 1.8 16V / 2.0i / 2.0 16V
- Product Codes: 1635R4, 1635V1
- Other Numbers: Verify cross-reference with a vehicle-specific parts catalog or VIN lookup
If you are unsure about fitment or installation, consult a professional mechanic or provide your vehicle registration/VIN to confirm compatibility. Ordering the correct part code ensures a straightforward replacement and reliable engine operation.
