Known faults for the Volkswagen Passat B7.

Engine / equipment

7-speed DQ200 DSG gearbox (dry clutch, 0AM mechatronics), paired with 1.0/1.2/1.4 TSI and 1.6 TDI engines

Period mentioned

2008 onwards

Symptoms

Judder or shudder pulling away in 1st/2nd, reverse won't engage, PRNDS letters flashing or a spanner warning, gearbox stuck in one gear (limp mode).

Possible cause described

Mechatronic unit failure: the pressure accumulator develops fatigue cracks, the electric pump runs constantly and the gearbox loses pressure. The mechatronic's 30 A fuse sometimes blows. Wear of the dry dual clutch is also common.

Check for the garage

Read the gearbox module faults with VCDS, OBDeleven or similar and check the mechatronic fuse.

Cost cited in the source

€350–550 to repair the mechatronic unit alone; €1,000–1,200 including removal and refittingA rough figure from the original database, not an up-to-date quote.

Sources from the original database

Engine / equipment

1.2 / 1.4 TSI-TFSI EA111 (Polo, Golf V/VI, Ibiza, Fabia, Octavia, Audi A1, Yeti, Touran…)

Period mentioned

2006–2014

Symptoms

Rattle on a cold start, engine light for timing deviation; if the chain jumps, the engine cranks but won't start.

Possible cause described

A narrow chain and a hydraulic tensioner that loses pressure: the chain stretches, often between 60,000 and 100,000 km. VW revised the chain, guides, tensioner and camshaft.

Check for the garage

Listen to a cold start and read the timing deviation values with VCDS. Ask for an invoice showing the revised kit was fitted.

Cost cited in the source

€800–1,500A rough figure from the original database, not an up-to-date quote.

Mileage cited in the database: 60,000–100,000 km. This is not a maintenance interval and does not predict a failure.

Sources from the original database

Engine / equipment

Air conditioning with clutchless compressor and N280 regulating valve (combustion VW, Audi, Seat, Cupra and Skoda from 2006)

Period mentioned

2006–2026

Symptoms

The air does not cool or cools intermittently (for example only at motorway speed), and sometimes the compressor rattles with the A/C on. Codes 01232 (N280 valve), P2612 or 00898.

Possible cause described

The compressor regulates its output with the N280 solenoid valve, its most common failure point. Audi issued technical bulletins over a manufacturing fault in this valve on Sanden compressors. Its connector can also become brittle and corrode (especially without the engine undertray), or the wiring fails.

Check for the garage

Read the codes and N280 control current with VCDS or ODIS, measure its resistance (about 10 ohms) and check the connector and wiring before replacing parts. If the valve or compressor is replaced, the whole circuit must be flushed.

Cost cited in the source

N280 valve: a cheap part (about 30 dollars) where sold separately; new compressor with circuit flush: considerably moreA rough figure from the original database, not an up-to-date quote.

Sources from the original database

Engine / equipment

4th and 5th generation Haldex coupling in transverse-engine VAG all-wheel-drive cars: VW 4Motion, A3/TT/Q3 quattro, Skoda 4x4 and Seat/Cupra 4Drive

Period mentioned

2007–2020

Symptoms

All-wheel-drive warning or a pump error in diagnostics, the car behaves like front-wheel drive (wheelspin in the wet or on gravel) and sometimes no cluster warning even with stored codes.

Possible cause described

The electric pump that pressurises the coupling loses flow because the filter (4th generation) and the pump strainer clog with wear debris; dirty oil raises its current draw and burns it out. According to forum owners, dealer services often change the oil but not the filter or strainer, and a new pump fails again if this is skipped.

Check for the garage

Read the all-wheel-drive module with VCDS, OBDeleven or ODIS (ODIS shows the pump current) and check in the history when the oil was changed and whether the filter was replaced and the strainer cleaned. After servicing, an adaptation with diagnostic equipment is recommended on generations 4 and 5.

Cost cited in the source

Oil, filter and strainer cleaning: maintenance. If the clutch plates are destroyed, an S3 owner quotes about £4,000 to replace the whole unit.A rough figure from the original database, not an up-to-date quote.

Sources from the original database

Engine / equipment

1.6 and 2.0 TDI (EA189 and EA288)

Period mentioned

Approx. 2010–2020

Symptoms

Coolant level drops with no visible leak, white smoke with a sweet smell, rising temperature or engine light. In severe cases the engine hydrolocks.

Possible cause described

The internal tubes of the EGR cooler crack and coolant enters the intake. It worsened after the post-Dieselgate software update, which increased EGR use.

Check for the garage

Cooling system pressure test and check for coolant in the intake or manifold.

Cost cited in the source

€400–1,300A rough figure from the original database, not an up-to-date quote.

Sources from the original database

Engine / equipment

1.8 / 2.0 TSI-TFSI EA888, 2nd generation

Period mentioned

Approx. 2009–2015

Symptoms

Very high oil consumption (over 1 litre per 1,000 km), low oil warning, bluish smoke, oil-fouled spark plugs.

Possible cause described

Piston rings that are too thin carbon up and lose tension, letting oil into the combustion chamber. The crankcase ventilation (PCV) valve can also contribute.

Check for the garage

Controlled oil consumption test over 1,000 km, compression or leak-down test and a PCV valve check.

Cost cited in the source

€3,000–5,000 (new pistons and rings)A rough figure from the original database, not an up-to-date quote.

Sources from the original database

Engine / equipment

1.8 / 2.0 TSI-TFSI EA888, 1st and 2nd generation

Period mentioned

Approx. 2008–2015

Symptoms

Metallic rattle for a few seconds on a cold start, engine light for camshaft/crankshaft correlation; in the worst case the engine won't start after a loud noise.

Possible cause described

The hydraulic chain tensioner (old design) loses pressure on cold starts, the chain goes slack and can jump teeth, causing valves to hit pistons.

Check for the garage

An inspection plug on the lower timing cover shows the tensioner position. Listen to a cold start.

Cost cited in the source

€1,500–4,000 (chain, guides and tensioner)A rough figure from the original database, not an up-to-date quote.

Sources from the original database

Engine / equipment

DQ250 6-speed wet-clutch DSG (2.0 TDI, 2.0 TSI and other powerful engines in the Golf, Passat, Tiguan, A3, TT, Octavia, Superb, Leon…)

Period mentioned

2003–2020

Symptoms

Jerking or shudder when pulling away and at low speed, harsh shifts, gearbox warning or limp mode; codes P17BF, P189C, P0841, P0871 or P0717.

Possible cause described

In most cases the cause is the mechatronic unit (the electro-hydraulic control unit), not the clutches. The oil shares a circuit with the clutches and degrades, carrying debris that damages the valves; the pan can also rust and leak. Volkswagen specifies an oil and filter change every 60,000 km.

Check for the garage

Read codes with ODIS or VCDS, check the oil change history, inspect the pan for rust or leaks and the clutch adaptation values. Replacing the mechatronic control board is often enough.

Cost cited in the source

Oil and filter change: maintenance every 60,000 km; control board or mechatronic: expensive repairA rough figure from the original database, not an up-to-date quote.

Mileage cited in the database: from 60,000 km. This is not a maintenance interval and does not predict a failure.

Sources from the original database