Buy New and Used Van and Car parts

Find best value great quality parts at cheap prices for your car, van and 4X4s HERE!

Not sure of reg or non-UK reg? Enter make and model here

Not sure of reg? Enter Make and Model manually

Find any Van or Car Part for free, Saving time and Money £££

Find parts now

1Enter your Registration

2Select what parts you want

3Buy parts now or get free personalised quotes

Check our right part guarantee and see how your money is secure when purchasing on

Used Citroen TDC Sensors

All used Citroen TDC Sensors listed on are tested, original (OEM) manufacturer parts and come with a 14 day money back guarantee. list cheap new OES or aftermarket car parts at discounted prices and used OEM car parts up to 80% cheaper than main dealer prices for Citroen from premium breaker yards from across the UK.

About TDC Sensors

The Citroen TDC sensor (Top Dead Centre sensor) is an important and clever electronic sensor which works in conjunction with the car's ECU, playing a crucial part in enabling the engine to run on time and smoothly. Information gathered by the TDC sensor is sent to the ECU which uses it, along with information from other engine sensors, to determine and control the ignition and fuel injection timing of the engine, transmission changing and variable valve timing. 

The TDC sensor can be found in the engine compartment, positioned on the gear box above the fly wheel, or mounted on the top of the transmission bellhousing at the left-hand end of the cylinder block. It can be easily seen when the air box is removed. 

It is common for an internal combustion engine to use a four-stroke action.  The intake stroke, which is the first stroke of the pistons, draws an equal amount of air from the inlet manifold into each cylinder, delivering the air via the air intake valve. For the next three strokes of the engine the air intake valves are shut while compression, combustion and exhaust processes are occurring. Then the intake valves open again and once more the air is drawn through into the cylinders from the inlet manifold. The spark plugs should fire, igniting the fuel in the cylinder, when the piston is at top dead centre. When the piston is in this position, the air intake valves are shut while compression, combustion and exhaust processes are occurring. The TDC sensor lets the ECU know when a cylinder is at top dead centre and the ECU then instructs a spark to be sent to the correct cylinder at the correct time for ignition to occur. The spark is produced via the spark plug which provides an electrical current to the combustion chamber in a cylinder in a petrol engine. The spark produced ignites the engine enabling the air/fuel mix to burn in the cylinder and combustion to occur. A defective TDC sensor can literally stop the engine from starting. If the engine does start, a fault with this sensor may cause the engine to run poorly. 

As is often the case with electrical components, the TDC sensor can fail because of damage caused by corrosion or it can simply wear out. A faulty TDC sensor may cause the engine control unit to miss a correctly timed signal and the spark may not ignite in the right cylinder at the right time, which could lead to the engine operating badly or ceasing to work. Correct operation of the TDC sensor is vital to the running and timing of the engine. It is wise to consult with your mechanic when experiencing problems with ignition and the engine, to ensure the correct fault is found and fixed as soon as possible. When this electronic sensor goes wrong, it is important install a compatible replacement part. The Citroen TDC sensor offers complete compatibility, specifically manufactured for the make and model of your vehicle.

Citroen trivia

  • The Citroën 2CV Safari had some crazy extra features. It was a four-wheel-drive vehicle, and Citroën decided that four-wheel drive meant that it would be better to have two at the front and one at the back. The fuel cap sticks out of the driver's door, and the tank was right under the driver's seat!
  • After WWII, Michelin owned Citroën and wanted to make a car for the people. The Citroën 2CV was designed for driving on French roads, so it was incredibly sturdy, and tests were carried out by driving through ploughed fields with trays of eggs on the seats. Although changes in design happened, some version of the Citroën 2CV was in production from 1949 all the way through to 1990.
  • The 1934 Citroën 7CV was the first mass-produced car to have front-wheel drive, hydraulic brakes, and real suspension! This basic design found its way into subsequent models right up until three decades later in the mid-1950s.
  • Unfortunately, the founder of Citroën went bankrupt in 1934, even though the cars they produced were selling well and incredibly popular. The company exists today because tyre company Michelin bought the majority of shares in the company.
  • The founder of the company, André Citroën, is renowned as something of a genius when it comes to marketing. He specifically targeted adverts for the 1922 Citroën Type C at women owners, and soon after the car became very popular, earning the nickname 'Petit Citron' after the distinctive lemon yellow paint job.