CAT’s Inside Line: CES


1.8 & 2.0 TFSi Petrol Engine

  • The engine can sometimes be difficult to start. An engine light will appear with a ‘camshaft shaft position bank 1’ fault description. This will be caused by a failure of the non-return valve and filter basket on the end of the camshaft (front), leading to score marks and the partial seizure of the cam shaft. As a result the valve timing jumps, which results in the engine start problems.

2.0 TDi Diesel Engine

  • The Piezo Injectors are a frequent issue. Solenoid shorts to earth on the injectors. In this instance the injectors should be replaced. This applies to the 170ps engine only.
  • The EGR valves can cause problems, such as running issues, problems starting and a lack of power.

2.0, 2.7 and 3.0 TDi Diesel Engine

  • Faulty throttle intake valves can cause the engine management light to illuminate with a description ‘error for lower limit not reached’. This will be caused by the intake flap spindle wearing, which results in oil ingression into the intake valve shaft. Here’s an example of an electric fault code being logged, when the cause is actually a mechanical issue.

Diesel Engines

Lots of newer diesels are now fitted with Diesel Particulate Filter Sensors. It’s important to check the sensors, as they’re a common problem. If fitting a new DPF, its recommended that you fit and calibrate new sensors too.


When servicing the Audi A4, all automatic gearboxes must have gearbox oil and the oil filter changed every 38,000 miles (apart from Quattro models, which are sealed for life). On older 2004 – 2008 models timing belts needed changing every 5 years or 75,000 miles. 2008 models onwards now have a timing chain, rather than timing belt fitted, which should last the lifetime of the car (unless the wrong oil is used, as this causes the chain to expand). Brake fluid needs to be changed after 3 years from new and then every 2 years afterwards.


The A4 range of models is simply huge. The variety of body shapes, engine sizes, transmission and engine types means there’s very little commonality between exhaust components. For instance the manual gearboxes, automatic gearboxes and semi automatic gearboxes will all have a different front pipe.  Technicians need to sure about exactly which model they’re working upon, to receive the right part. In turn distributors need to offer a huge range of part numbers for the Audi A4, which CES does.

Depending on the model, some A4s use conventional rolled exhaust silencers, some use pressed clamshell type, and some even use an odd looking trapezoidal shaped main silencer. Not all of the aftermarket offerings are able to replicate the style of the OE offering. CES with the help of our manufacturing partners, will always try to offer a part that looks like the OE part as well as performing like the OE part.

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