1.9 TDI PD (AJM/ATD/AXR/ASZ/ARL/BKC/BXE/BLS)

Light knocking from the bottom of the engine that grows louder, then sudden stall at low revs under light throttle and oil sprayed over the engine

Bearing shells rotate or wear out on the late 105 PS codes BXE and BLS (BKC also named by some sources); German media attribute it to a material fault, worst years 2006-2008, more frequent on long-life oil intervals. Owner cases at 93,000, 106,000 and 131,000 miles. Caught early: shells and crank grind ~2,000 PLN (converted ~465 EUR); otherwise a replacement engine (~5,000 GBP quoted, converted ~5,850 EUR). PD noise masks the warning knock.

Preventive only - a snapped belt bends valves

Interval 90,000-120,000 km by engine code (60,000-70,000 miles per UK guidance). Replace tensioner, rollers and water pump with the belt; inspect cam and followers while the cover is off.

Metallic ticking from the top of the engine, loss of power and economy, more smoke, hard cold start, diesel smell in the oil in late cases

The camshaft drives both the valves and the unit injectors, and factory cam and lifter hardness was insufficient; wrong oil (not VW 505.01) and tandem-pump leaks accelerate it. Repair can exceed 30,000 CZK (converted ~1,200 EUR). Affects all PD codes (AJM, ATD, AXR, ASZ, ARL, BKC, BXE, BLS); specialists suggest inspecting cam and followers at every belt change. Ignored, lifters and valves fail.

Rattle at idle and on shutdown, vibration through the clutch pedal, judder on take-off

DMF from ~1,000 PLN, ~2,500 PLN with clutch kit (converted ~235-580 EUR). Reported from 100,000 miles; an owner example reached 290,000 km before replacement. Tuning shortens its life.

One cylinder down - rough idle, uneven running, soot, single-cylinder correction value out of range in diagnostics

Piston, solenoid or seat wear makes one element drift; the valve-cover harness can also chafe and corrode and mimic a bad element. Regeneration 300-600 PLN per element, new 1,250-2,500 PLN (converted ~70-580 EUR). Sensitive to fuel quality.

Power loss at low revs then surge, limp mode with boost codes, loud whistle, rising oil consumption

Variable-geometry vanes soot up and the actuator linkage rusts, especially on cars driven gently at low revs. Actuator alone ~350 PLN, VTG turbo from ~2,200 PLN (converted ~80-520 EUR). Cleaning the vane ring often restores a sticking unit.

Diesel smell, fuel or oil weep at the pump on the cylinder head, rising oil level, hard starting

The combined fuel-lift and brake-vacuum pump seals age; a leak can push diesel into the oil and accelerate camshaft wear. Reported at 80,000-130,000 miles. Fix early.

Gradual power loss, black smoke under load, rough idle, EGR fault codes

The most common cause of power loss. EGR valve with gasket ~36 EUR, replacement 250-500 PLN (converted ~60-120 EUR); soot noticeable from ~80,000-100,000 miles. Parts only - add labour for cleaning the intake manifold.