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When a Warranty Pays for the Part but Not the Pain

Garage News
July 27, 2026
JT

A trade problem hiding in plain sight

In an email to MOTester, Emma Johnson of Prudhoe Car & Van Ltd described a frustration many independent garages will recognise. One replacement turbo, she said, appeared to trigger limp-mode symptoms without fault codes until a different-brand unit was fitted. She also reported repeat water-pump leaks after fitment, with labour allegedly rejected under warranty, leaving the garage out of pocket on diagnostics, refitting time and a second surcharge.

MOTester has not independently verified the root cause of each case, and any component failure can involve manufacturing defects, application errors, installation issues or wider vehicle system conditions. However, the concerns raised reflect a wider issue frequently discussed across the independent aftermarket.

What makes the complaint particularly significant is the backdrop against which garages are now operating. Britain’s vehicle parc is getting older, not younger. Department for Transport figures show the average licensed car in the UK reached 10 years old by the end of 2025, while the Society of Motor Manufacturers and Traders (SMMT) reported that 45.7% of cars on UK roads were more than a decade old during 2025. Older vehicles inevitably require more maintenance, more replacement components and greater reliance on the aftermarket to keep motorists on the road.

The problem is often the contract, not just the component

Garages understandably hear the word “warranty” and assume there is a safety net. In law, however, trade buyers do not occupy the same position as consumers.

Trading Standards guidance for business-to-business contracts explains that businesses do not enjoy the same automatic rights as consumers, with liability often limited or excluded through contractual terms. While reasonable business losses may sometimes be recoverable, suppliers frequently disclaim consequential losses within their terms and conditions.

At the same time, Section 14 of the Sale of Goods Act 1979 continues to imply that goods supplied in the course of business should be of satisfactory quality.

That is the gap many garages fall into. The law still implies that goods supplied in the course of business should be of satisfactory quality, but the practical remedies available to trade buyers are often shaped by supplier contracts, claims procedures and exclusions relating to consequential loss.

NAPA’s UK warranty statement is unusually clear. Claims must be submitted in writing with proof of purchase, the component and sometimes the vehicle may require inspection, warranty is limited to replacement of the defective part, and NAPA specifically states it shall not be liable for consequential or incidental losses.

Similarly, GSF Car Parts states that products carry a minimum 12-month warranty unless otherwise specified, but its published terms also exclude liability for consequential losses or repairs carried out without prior authorisation.

Why turbos and water pumps create the biggest disputes

The issue becomes particularly significant with components where diagnosis is expensive and failure can be open to interpretation.

Autocharge states that its turbochargers are remanufactured in the UK under ISO 9001 quality standards and are backed by a two-year warranty. Dolz’s published water-pump warranty provides two years or 50,000 km of cover, subject to correct installation, complete flushing of the cooling system and use of the manufacturer’s specified coolant. Likewise, NAPA requires parts to be correctly selected from its catalogue and fitted according to vehicle manufacturer specifications before warranty cover applies.

None of those conditions are unreasonable. Turbochargers and cooling-system components can genuinely fail because of contamination, incorrect oil or coolant procedures, blocked oil feeds, poor flushing or incorrect application.

The difficulty is that by the time a garage has completed extensive diagnostics, removed the component, returned it for inspection and waited for a decision, the commercial damage has already been done. The replacement part may eventually be supplied or credited. The lost workshop time usually is not.

Labour is where the real loss sits

That is why Johnson’s experience resonates with so many independent garages.

The true cost of a faulty component is rarely the component itself. It is the duplicate diagnostics, the additional workshop time, administration, customer communication, technician hours and disruption to workshop scheduling that cannot simply be billed twice.

Even where a supplier agrees to contribute towards labour, the reimbursement often bears little resemblance to the rates garages actually charge. Many trade warranty schemes cap labour payments at around £35 per hour, while independent workshops frequently charge considerably more depending on location, overheads, equipment investment and technical expertise. As a result, even successful labour claims can still leave garages absorbing a significant proportion of the real cost of diagnosing, removing and refitting defective components.

The Motor Ombudsman’s current Vehicle Warranty Products Code states that labour costs should be covered unless specifically excluded or subject to a stated maximum labour rate. It also expects accredited businesses to respond to warranty claims within five working days.

However, that code applies to business-to-consumer relationships rather than business-to-business supply agreements. In other words, the consumer warranty sector already recognises that labour reimbursement, response times and transparency matter, while independent garages purchasing parts on trade terms often enjoy far fewer protections.

Good paperwork is part of the repair

There is also an important lesson for workshops themselves.

The Motor Ombudsman’s Service and Repair Code recommends agreeing diagnostic and exploratory work during the booking process, clearly explaining any warranties on parts and labour, and retaining records for at least six years.

Although that code is aimed at consumer-facing businesses, it provides an excellent benchmark for workshop best practice. Every warranty-related repair should be thoroughly documented, including customer complaints, diagnostic findings, test results, installation procedures, fluids used, photographs where appropriate, the condition of removed components and every communication with the supplier.

If a warranty dispute develops, good documentation becomes evidence rather than administration.

What should happen next

The aftermarket does not need fewer warranties.

It needs better ones.

If labour is excluded, that should be made absolutely clear at the point of sale. If prior authorisation is required, garages should have rapid access to technical support before commencing work. Where inspection is necessary, suppliers should publish realistic turnaround times and adhere to them. Components with high comeback rates should be supported by better installation guidance, transparent failure-analysis criteria and quicker provisional decisions.

These are not luxuries. On an ageing vehicle parc, they are increasingly part of the product itself.

Emma Johnson’s email should not be viewed simply as a complaint about one turbocharger or several leaking water pumps. It highlights a much broader challenge facing the independent aftermarket. When component failures occur and warranty obligations stop at replacing the part, the independent garage effectively becomes the insurer of last resort.

The independent aftermarket has earned its reputation by keeping Britain’s ageing vehicle fleet on the road. That success depends not only on the quality of the parts supplied, but also on confidence that when something does go wrong, the process of putting it right is fair. Clearer warranty terms, realistic labour reimbursement, faster technical support and transparent claims handling would benefit suppliers, distributors, garages and motorists alike.

Because when a replacement part fails, the true cost is rarely the component inside the box. It is the time, trust and goodwill that disappear with it.

Have you experienced similar problems with parts warranties, suppliers or other issues affecting your workshop? Or is there a topic you’d like MOTester to investigate? We’d love to hear from you. Get in touch with the editorial team and your experience could help shine a light on issues affecting independent garages across the UK.

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