Audi A4 2.0 TFSI B7

This is the most important maintenance item on any EA113 2.0 TFSI. The cam follower is a small metal disc that sits between the intake camshaft lobe and the high-pressure fuel pump plunger. It wears down over time and, if not caught, metal debris enters the fuel pump and the camshaft lobe gets ground down. A new cam follower costs around 10-20 euros and should be inspected every 15,000-20,000 km. If caught early, replacement is trivial and cheap. However, if the follower wears through completely, the camshaft lobe and fuel pump are damaged: a new HPFP costs 400-600 euros and a camshaft replacement runs 800-1,400 euros including labor. Forum consensus is that nearly every high-mileage B7 2.0T will need at least one cam follower replacement, and roughly 15-20% of cars that were not proactively maintained have suffered HPFP or camshaft damage.

All EA113 TFSI engines suffer from carbon buildup because fuel is injected directly into the cylinder, bypassing the intake valves. Over time, typically between 60,000-120,000 km, carbon deposits restrict airflow and cause rough idle, cold-start misfires, hesitation, and reduced power. The fix is removing the intake manifold and cleaning the valves via walnut shell blasting or chemical treatment. Professional walnut blasting costs 400-800 euros at independent specialists in Europe. This is essentially unavoidable on any high-mileage direct-injection engine and should be considered every 60,000-80,000 km. Italian tune-ups (sustained high-RPM driving) and quality fuel can slow the buildup but not prevent it.

The original diverter valve uses a rubber diaphragm that degrades over time due to heat and pressure cycling. When it tears, boost pressure escapes, causing the turbo to underperform. Symptoms include loss of power under acceleration, a hissing sound from the engine bay, and fault code P0299 for turbo underboost. The original diaphragm-style valve can be replaced with the revised piston-style valve (Audi updated the design), which is far more durable. Parts cost 50-100 euros for the revised OEM valve, and labor is 50-150 euros. Aftermarket options from Forge or GFB are also popular. This is extremely common on cars over 60,000 km and is one of the easiest fixes on the car.

The PCV system on the EA113 is known to degrade, particularly the valve integrated into the valve cover. When it fails, symptoms include blue smoke at wide-open throttle, oil accumulation around the valve cover and filler cap, rough idle, and reduced boost pressure. In severe cases, oil can be drawn into the ignition coil wells, causing misfires. Replacement typically involves a new valve cover assembly (150-300 euros) plus 100-200 euros labor. PCV delete kits are available for around 80-120 euros but may not pass emissions testing. Most cars will need PCV attention between 80,000-150,000 km.

The intake manifold on the EA113 has variable-length runners controlled by a flap motor that is prone to failure. Symptoms include check engine light with codes for runner control stuck open, implausible signal, or regulation deviation. The car may run slightly rough or have minor performance loss, but it is not immediately dangerous. A new flap motor costs 200-350 euros plus 100-200 euros labor. Alternatively, intake manifold runner flap delete kits are available for around 30-50 euros and can be combined with an ECU remap to eliminate the fault codes permanently. This is a moderate-frequency issue that typically occurs after 80,000 km.

Ignition coil packs on the 2.0 TFSI tend to fail around 60,000-100,000 km, particularly if PCV issues are causing oil to seep into the coil wells. Symptoms include cylinder-specific misfire codes, rough idle, and hesitation under load. Individual coils cost 25-50 euros each. It is recommended to replace all four simultaneously if multiple have failed. Total cost for four coils plus spark plugs is typically 150-400 euros depending on whether you use OEM or aftermarket parts. Labor is minimal as the coils are easily accessible. Some models may be covered under an Audi recall for faulty ignition coils.

The K03 turbocharger is generally reliable and most B7 2.0 TFSI engines will never need a turbo replacement. Failures typically only occur beyond 150,000-200,000 km or when oil changes were neglected, causing bearing wear from oil starvation. Symptoms include excessive exhaust smoke, oil consumption through the turbo seals, and whining noises. A new OEM K03 costs around 500-800 euros, with aftermarket replacements available from 300-500 euros. Labor is typically 500-800 euros. Rebuilt turbos are available from 250-400 euros. For most owners, this is a low-probability issue if oil changes are kept on schedule.

This issue only affects front-wheel-drive models equipped with the Multitronic CVT automatic. Quattro models use a conventional Tiptronic or manual gearbox. The Multitronic is known for chain wear, transmission control module (TCM) failures, and clutch pack degradation. Symptoms include shuddering during acceleration, hesitation, jerky shifts, and warning lights. TCM repair costs around 200-400 euros, but if the chain or clutch pack fails, a full rebuild runs 2,500-4,000 euros and a replacement gearbox costs 3,500-5,000 euros. Audi did not specify a service interval for the CVT fluid, calling it a lifetime fill, but specialists strongly recommend changing the fluid every 60,000 km. Manual gearbox and quattro Tiptronic versions are significantly more reliable.