A Volkswagen GTI owner says a $7,000 engine and transmission replacement turned into another expensive problem. The replacement engine reportedly suffered damage before the car was even picked up from the repair shop.
The owner described the situation in an October 12 Reddit post, explaining that a mechanic initially declared the 2017 GTI repaired and ready for collection. Two days later, the shop reportedly discovered a new problem.
According to the owner, an electrode from a reused spark plug broke off inside the third cylinder of the replacement engine, causing internal damage. The mechanic reportedly suggested the plug might have contained a microscopic crack that escaped visual inspection.
Now, the customer faces a dispute over warranty coverage and the remaining $3,400 repair balance, raising questions about who should pay when a component reused during an engine swap fails.
Engine Swap Trouble
Mechanic replaced my engine, and said it was ready for pickup. Two days later told me it’s broken again.
by
u/DeepMortgage5887 in
AskMechanics
In the original r/AskMechanics post, the owner explained that the replacement engine had about 49,700 miles, while the transmission had about 55,300 miles.
The $7,000 agreement included installing the used components, and the owner had already paid $3,600.
Before installation, the mechanic reportedly explained that the replacement engine carried a warranty. Both parties agreed they could reuse some existing components, but the owner specifically requested that the mechanic identify and replace questionable parts.
The owner said they supplied a new water pump and were prepared to purchase other components if needed. However, they maintain that the mechanic never discussed reusing the old spark plugs.
An unusual noise reportedly appeared while the completed vehicle remained at the shop, leading to the discovery of the damaged cylinder.
Who Pays?
The mechanic reportedly argued that the replacement engine’s warranty covered the long block but excluded failures caused by transferred components.
As a compromise, the shop offered to replace the damaged cylinder head at its own expense if the owner paid the outstanding $3,400 balance.
However, the proposal came without assurances that additional engine problems would not develop.
The owner also shared the experience in a separate r/GolfGTI discussion, where several commenters criticized the decision to reuse spark plugs during an engine replacement.
One commenter identifying as an Audi technician argued that transferring spark plugs from a failed engine was unreasonable unless the customer had explicitly declined replacements.
Others noted that new spark plugs generally cost relatively little compared with a complete engine swap.
Seeking A Resolution
The owner said a family member with a legal background became involved and confirmed they had documentation of communications with the shop.
Commenters recommended reviewing the written warranty and repair agreement before authorizing more work or making another payment. The exact warranty language has not been independently verified.
The dispute highlights an important consideration for anyone buying a used replacement engine: the engine’s warranty may not cover components transferred from the original motor.
Before approving a major repair, customers can request an itemized list identifying which components will be replaced, which will be reused, and whether failures involving transferred parts are covered.
As of the latest visible comments, the owner had not confirmed whether the shop completed the proposed cylinder-head repair or returned the GTI. The mechanic’s explanation of the failure has not been independently verified.