Description
Overview
The throttle body 1635R4 / 1635V1 is a direct-fit air control unit for PSA Citroën & Peugeot 1.8i and 2.0i 16V petrol engines. It regulates intake airflow to the engine management system, ensuring accurate throttle response, stable idle and consistent running. This part is commonly searched for by its product codes (1635R4, 1635V1) and is designed for professional workshops and experienced DIY mechanics looking for a correct-fit replacement.
Features & Benefits
- Direct fit for many PSA 1.8 and 2.0 16V petrol engines
- Restores throttle response, idle stability and drivability
- Compatible with factory electrical connectors and wiring
- Robust throttle plate and shaft design for long service life
Function And Symptoms Of Failure
The throttle body controls the amount of air entering the intake manifold under command from the engine control unit (ECU). Common symptoms of a failing or dirty unit include rough or fluctuating idle, reduced throttle response, stalling at low RPM, and illumination of the check engine light with related throttle or idle control fault codes. Failures are often caused by carbon build-up on the throttle plate, worn shaft/bearings, faulty throttle position sensor (TPS) or electronic actuator faults, and vacuum or gasket leaks.
Replacement And Installation
Typical replacement steps: disconnect the negative battery terminal; remove the air intake duct and associated sensors to gain access; unplug the electrical connector(s); unbolt the throttle body from the intake manifold; remove the old gasket and fit a new gasket when installing the replacement unit; torque mounting bolts to manufacturer specification; reconnect electrical connectors and intake ducting; clear fault codes and perform throttle relearn/adaptation if required by the vehicle ECU. Always inspect hoses and sealing surfaces for damage and replace the gasket to prevent vacuum leaks.
Maintenance
Regular inspection and cleaning of the throttle bore and plate during scheduled services can prevent most drivability issues. There is no fixed replacement interval; lifespan depends on driving conditions and maintenance. Many throttle bodies remain serviceable beyond 100,000 km if kept clean and properly sealed.
Technical Information
- Manufacturer: PSA / Citroën Peugeot
- Model: 1.8i And 2.0i 16V Petrol Engines (Citroën / Peugeot)
- Product Codes: 1635R4, 1635V1
- Other Numbers: 1635R4 | 1635V1
Compatibility Note
This unit is referenced by the listed product codes and fits multiple PSA applications. Always confirm compatibility by matching the part number on your old unit or checking the vehicle vehicle identification against OE references before purchase.
