Description
Throttle body (intake) DELPHI 1.6 HDi for Citroën and Peugeot vehicles. Most used units have a bent lower mounting bracket — must be secured with tape.
The DELPHI throttle body for the 1.6 HDi range is a direct-fit intake throttle valve designed for Citroën and Peugeot diesel engines. It controls airflow to the engine and works together with the engine management system to regulate idle speed, load response and regeneration cycles. This part is commonly searched by OE numbers 9655971980 and 0345E5, so listing these codes helps technicians and DIY enthusiasts find the correct replacement quickly.
Application And Compatibility
Designed for 1.6 HDi engines used in a range of Citroën and Peugeot models, including (but not limited to): Citroën C4, Citroën C4 Picasso, Citroën C5, Peugeot 207, Peugeot 307 and Peugeot 308. Always verify engine type (1.6 HDi) and part number before installation.
Function And Typical Symptoms
The throttle body modulates intake airflow according to signals from the engine control unit. Common symptoms of a failing or contaminated throttle body include unstable idle, delayed throttle response, reduced engine performance, increased fuel consumption and fault codes related to throttle position or idle control. On diesel HDi engines, carbon deposits on the valve and bore are a frequent cause of poor operation.
Replacement Procedure (Overview)
- Park the vehicle on a level surface and allow the engine to cool.
- Disconnect the negative battery terminal to prevent electrical faults while working on the intake system.
- Remove the air intake ducting and filter housing to gain access to the throttle body.
- Disconnect electrical connector(s) and any vacuum/boost hoses attached to the throttle body. Label hoses if necessary for reassembly.
- Unbolt the throttle body from the intake manifold. Note that the lower mounting bracket on many used units may be deformed and require secure fitting (see note below).
- Clean mating surfaces, fit the new throttle body with a new gasket if applicable, and tighten bolts to manufacturer torque specifications.
- Reconnect hoses and electrical connectors, reassemble intake components, reconnect the battery and perform an idle relearn/engine adaptation procedure if required by the vehicle.
Maintenance And Lifespan
Throttle bodies on 1.6 HDi engines typically last many tens of thousands of kilometres but are prone to carbon build-up, especially on vehicles with long motorway use or irregular regeneration cycles. Regular inspection during service intervals and gentle cleaning (when applicable) can extend functional life. Electronic failures of the actuator or position sensor shorten service life and require replacement.
Technical Information
- Manufacturer: Delphi
- Model: 1.6 HDi
- Product Codes: 9655971980, 0345E5
- Additional Numbers: 34500000
Installation Recommendations
- Always disconnect the negative battery terminal before starting work to avoid electrical damage.
- Use new gaskets and ensure all mating surfaces are clean and free of oil/carbon.
- Inspect intake hoses and clamps; replace any brittle or leaking components to prevent future contamination.
- After fitting, perform an idle adaptation or throttle relearn if the vehicle manufacturer recommends it.
- If the supplied unit has a damaged lower mounting bracket (common on used parts), secure it properly during fitment — temporary tape is only a short-term measure; repair or replace the bracket where possible to ensure correct alignment and sealing.
Most Common Causes Of Failure
- Carbon and soot accumulation causing the throttle plate to stick or the bore to restrict airflow.
- Electrical faults in the actuator or position sensor (wear, moisture ingress or connector corrosion).
- Mechanical damage to the mounting bracket or flange (impact or improper removal), which can cause air leaks or misalignment.
- Contaminated intake air due to faulty filters or leaking hoses, accelerating deposit formation.
This description is tailored for professional mechanics and experienced DIY technicians looking for a reliable replacement throttle body for 1.6 HDi Citroën and Peugeot vehicles. Including the OE numbers 9655971980 and 0345E5 will help ensure accurate search results and correct part selection.
