Volkswagen Golf Sportsvan, 2016, Espoo

The fuel flap does not close properly, but this does not affect driving.

The car has an engine fault. The injector and return line for cylinder 2 were replaced, but the problem did not disappear. Further measures mentioned in the message below (replacement of the high‑pressure pump, etc.) have not been done.

I drove the car home from the workshop (10 km) and it ran normally at low power. It makes noise when accelerating.

Below is the workshop message (also shown as a photo in the pictures):

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Message: In the Golf there have been recent problems with rough idling, slight loss of power, a "clicking" or "popping" noise under higher load and grey smoke. The problem can be observed for example when accelerating in 3rd or 4th gear.

Error code: P2002 - Particulate Trap Bank 1: Efficiency Below Threshold.

A forced DPF regeneration was done a week ago, and the car seemed to run better for about a day, but the symptoms returned quickly and softened somewhat within a few days.

I used some engine cleaner (Liqui Moly Diesel Purge) a couple of weeks ago, no effect.

The air filter has been changed.

So it is necessary to find out what is causing the Golf's problem and what is clogging the particulate filter. EGR, injector or air management issue?

-> Diagnostics €125/hour, charged by time used + Fault memory read €59

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Error codes read and printed -> The injector for cylinder 2 knocks strongly at idle and especially when accelerating. The particulate filter code is also present in the memory.

-> The starting point is to replace at least the injector and return line for cylinder 2: €1,111 (including diagnosis and injector coding) NOTE: assuming normal removal.

-> CUSTOMER APPROVAL GIVEN BY PHONE 14 July at 17:20. If the car can be finished on 15 July that is good, otherwise there is no rush for completion that week as the customer is travelling.

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- Injector for cylinder 2 replaced + coded remotely, OK

-> The engine now runs smoothly at idle

-> However, the high‑pressure pump still makes a very strong mechanical whining/grinding/knocking noise.

-> The high‑pressure pump must be replaced to bring correct pressures to the engine. It is likely that metal particles have come off the pump and clogged the injector for cylinder 2. The car should not be driven until the high‑pressure pump is replaced to avoid damaging more injectors. (One injector appears to have been replaced earlier and is not original.)

High‑pressure pump, its pulley, timing belt kit and water pump and required coolant replacement €2,555, approx. 3 days delivery time

Additionally it is impossible to say in advance whether metal from the pump has spread so that the repair will be sufficient — in the worst case the whole high‑pressure system may need renewing.

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Additionally the P2002 error may be secondary to injector/high‑pressure pressure faults, but it could also originate from EGR cooler clogging. This will, unfortunately, only be clear once the car's regeneration can be completed.