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Answers to some of the most frequently asked questions about car servicing and repair
Amongst all the vehicle or customer specific questions that we're asked about car faults, repair costs and service/warranty issues there are several common themes and more general questions that keep coming up.
You can find the answers below to the questions we're asked most often.
Why don't you get a full workshop manual? »
Why isn't clutch failure covered by the warranty? »
Can you detail the service schedule for my car? »
Do I have to get my car serviced by a main dealer? »
Who can fix problems with an automatic gearbox? »
Airbag renewal after 10 years. What should I do? »
Where can I buy a good reconditioned engine? »
How much is reasonable for garage labour? »
When should the cambelt be renewed? »
Can I get the manufacturer to pay? »
How long should a catalytic converter last? »
Must I get air conditioning serviced? »
What are the advantages of synthetic oils? »
There are many reasons why it is not practicable to supply detailed technical information and manuals with all new cars;
Dealers don't have a monopoly on repairing their products though - independent garages get fair access to the same technical information as the franchise dealers and car manufacturers can not insist as a condition of warranty that service and repair is carried out by their own dealers.
Clutch life can be seriously affected by poor driving style:
If the garage has repaired the car, but say the failure has been caused by driver abuse, then ask them for the old components and get a second opinion from another garage or mechanic. The garage is entitled to ask you to pay for the work before allowing you to take your car.
If one of the components has broken and caused the failure, then you may be able to claim under the warranty. Regrettably, if there is no evidence of manufacturing or material defect, you will have to pay for the new clutch and cost of fitting.
We can't provide detailed extracts from manufacturers' workshop manuals.
The vehicle handbook will include basic service interval information.
Any reputable independent garage should have access to manufacturer's technical data, including details of the manufacturer's service times, schedules and operations.
You are not obliged (since October 2003) to get the car serviced by a franchise dealer during the warranty period.
You must though get it serviced according to the manufacturer's recommended schedule and criteria using only manufacturer approved parts.
The legislation only applies to the part of the warranty offered by the manufacturer, i.e. insurance-backed extended warranties offered by dealers are not covered and may stipulate different conditions.
If you do get the car serviced outside the dealer networkyou must make sure it's done to the maker's recommended schedule and criteria using approved parts. You must also keep records so you can demonstrate to the manufacturer that servicing was undertaken to their requirements.
You should still get warranty work undertaken by the franchised dealer as it is easier for them to deal directly with the manufacturer.
Read about repairs after the warranty expires before deciding to go outside the dealer network for servicing during the warranty.
Automatic gearboxes are complex pieces of equipment and sometimes need very specialised knowledge.
If it's a problem with the electronics which control the gearbox, it is better to get help from a franchise dealer as they will receive regular software updates from the manufacturer. This may cure the problem.
If it's thought to be a problem with the gearbox itself, then you may achieve more success if you contact a member of the Federation of Automatic Transmission Engineers
When cars were first fitted with airbags there was a lack of knowledge and confidence about the long term reliabiilty of the systems . Car manufacturers and manufacturers of airbag systems agreed to validate (or test) them for a 10 year life span.
A sodium azide tablet produces the gas which inflates the airbag, and this tablet and the explosive device are sealed. Although some moisture ingress is possible it should not affect performance. There will also be some natural chemical decay, but again this shouldn't stop the airbag from working.
There was also some concern in the early days that the airbag cover could become brittle through aging and a flying fragment cause eye damage.
Manufacturers increased the validation period to 15 years on later cars without making major changes to design and we are not aware of any airbag failures atttributed to ageing.
The word 'reconditioned' has different meanings to different repairers. Some may do little more than apply a fresh coat of paint, while others will dismantle the engine fully, machine bearing surfaces and rebuild the engine to a good standard using many new parts.
Don't be tempted by cheap units from back street garages. Previous history and internal condition are often unknown and they can work out to be more expensive in the long run. Resolving problems can be very difficult, too.
Reconditioned engines supplied by members of the Federation of Engine Remanufacturers (FER) will have been rebuilt to a high standard. And if there are any problems, you can seek help/arbitration from the FER.
Vehicles are complex with multiple sensors and electronic control units to keep exhaust emissions to a minimum, improve stability/braking and to operate safety systems.
Get a quote from several garages in your area and compare their hourly labour rates.
There's not a standard change interval for cambelts.
It does no harm to renew the belt early. If you buy a used car it's wise to get the belt renewed if you are in any doubt that it has been renewed at the appropriate time.
The manufacturer is under no obligation to help you once the warranty has expired, as it's generally accepted that faults caused by manufacturing or material defects will show up during the warranty.
Read more about repairs after the warranty expires »
Catalysts often last 10 years, but actual life depends on mileage and engine tune. 50,000 miles is a more reasonable benchmark, and you can generally expect to replace the catalytic converter once during the life of a vehicle.
If failure occurs early, it's important to find and fix the cause of the problem before fitting a new CAT otherwise the replacement can be expected to fail prematurely too.
There are three main ways they fail:
Regular servicing is important for health and to maintain the system working effectively. Up to 15% of the refrigerant gas will be lost annually.
Synthetics and semi-synthetics give improved performance at high temperatures and support extended standard drain intervals. They are the preferred choice for high perfomance cars or for drivers who value long life/durability.
If the manufacturer has confirmed that synthetic oil is suitable for your vehicle and you intend to switch then you must make sure that the engine is drained fully of mineral oil first.
(Updated 22 February 2013)