Golden rules for buying a used car

If the catalyser rattles on start-up, the matrix inside it is loose, and the catalyser needs to be replaced.

If the catalyser rattles on start-up, the matrix inside it is loose, and the catalyser needs to be replaced.

Published Sep 13, 2012

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When thinking of buying a used car, I believe it’s wise to have the vehicle carefully vetted by somebody who is familiar with the make and model.

As with any big luxury car, when repairs and spares are required, prices will often be high and specialist treatment required.

Avoid non-runners and any private sale where the car is described as “needing some attention”. On any used luxury car, a decent road test and expert advice are essential. Also, enquire about known faults and the cost of rectification.

For example, on any car with a catalytic converter and where there is a rattle on starting, get under it and give the car a shake. If it proves to be the culprit, either demand a replacement be fitted, or give the car a miss.

Renewing a cat could cost you thousands and turn your “bargain buy” into a nightmare. I shall not quote starting prices lest I be accused of causing alarm and despondency!

A fairly common, if not so disastrous a problem on the Audi A4, A6 and A8 is stalling immediately after starting.

There is a coil reader in the ignition barrel that connects to the immobiliser control unit, and the wire can give trouble, in which case renewal is called for.

Okay, the wire is cheap enough, but fitting it is a hassle, and involves removing the steering wheel and some of the ignition casing. In other words it’s a fiddly job.

On the A8 particularly, look out for leaks from the diff seal. Again, putting this right is an involved and potentially pricey job.

Audis are extremely good cars and capable of huge mileages before major work becomes necessary but, when buying any used luxury vehicle, look for one with a full service history.

Of course, the latest fuel price hike is a blow to most of us and will have a knock-on effect on prices far removed from motoring.

This being so, if your car has not been serviced for quite a while, now is the time to get it done to try to offset the extra running costs.

The service should include several checks, including compression and condition of spark plugs, restricted exhaust system, dirty air cleaner element and leakage around the intake manifold.

Ignition timing will also be checked and reset if necessary.

A high fuel level in the carburettor could be due to a faulty inlet needle and seat, so check for a proper seal.

Regular servicing need not cost a lot and will save you money in the long run. - Star Motoring

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