If you own an Audi, you may experience some issues with the engine from time to time. Even though Audi symbolizes elegance and power, and is the definition of well-crafted vehicles, there have still been some weak areas in manufacturing, especially with the engines. In order to keep their vehicles in proper working condition, current and prospective owners are highly encouraged to become aware of engine-related issues that have been known to plague certain Audi models. To help you in this endeavor, we wanted to delve into the engine issues for various Audi models.

When your Audi’s engine needs to be repaired or serviced for maintenance, you don’t want to take it to just anyone. When it comes to engine maintenance and repairs, drivers have been able to count on our team at Triangle Imports for over 20 years. We provide detailed, precise service to ensure your Audi performs at the level you expect. To ensure you’re 100% comfortable with the Audi engine services we provide, all Audi repairs are backed by a 24 month/24,000 mile warranty. So next time you need Audi repair in Raleigh, remember to bring your car to Triangle Imports!

Audi A4 Engine Issues

The Audi A4 is a versatile, compact entry-level luxury car with Avant wagon, cabriolet, and sedan versions available,

Carbon buildup

Any Audi A4 with the 2.0FSI, 2.0TFSI, and 3.2FSI is subject to the dreaded carbon buildup issue. To rectify the buildup, a professional Audi engine mechanic will need to clean the intake manifold, ports, and cylinder heads. This can be extremely costly, especially since it’s recommended to have this service performed every 20,000 miles.

Failing catalytic converters

Failing catalytic converters will release a foul smell, causing the vehicle to fail an emissions test, and will also result in a loss of power.

Engine oil leaks

Failing or bad valve cover gaskets are an issue. Leaks in the valve cover gasket will result in spark plug tubes filling with leaked oil, which can be catastrophic and also cause engine misfires.

Failed ignition coils

This will occur often before 100,000 miles and is due to spark plug misfiring. The fix is to replace spark plugs and ignition coils altogether.

Vacuum line leakage

Be sure to have your engine’s vacuum lines inspected thoroughly and routinely, as they’ve been known to crack and leak. Warning signs will be leaving a trail of leaked oil.

Failing ECU (Engine Control Unit)

If you notice your check engine light illuminating, your car stalling or misfiring, immense and inconsistent lack of power, or the inability to start altogether, there is a strong chance your Audi’s ECU is failing. A vehicle’s ECU can cause catastrophic issues with the overall functionality of your car if it fails. Because Audis are considered technologically sophisticated, it is highly recommended to contact a certified and experienced import technician to inspect a failing ECU.

Oil pump drive chain failure

If you notice a grinding and screeching noise coming from your car’s engine bay, there is a solid chance your worn oil pump and balance shaft drive chain need to be replaced. If the timing chain has not broken yet, it is possible to replace the tensioner, chain, and oil pump drive gear as opposed to replacing the entire system altogether.  The oil drive pump will bolt to the oil pump.  If neglected for too long, there is a chance that the gear will not be removable from the end of the crack. If this is the case, your vehicle may need an entire engine replacement.

Timing belt and water pump failure

It is highly recommended that Audi vehicles have their timing belt and water pumps examined thoroughly every 10,000 miles to avoid failure. One common mistake Audi owners and mechanics make is using contaminated coolant. Coolant contamination has been known to turn aluminum-colored water pump dark grey or black. This indicates acids have been left in the coolant system and ate away at the system’s internal seals. Be mindful of what kind of flushing agent is put in your vehicle’s water pump!

Audi’s water pumps are also known to begin leaking because their seals or internal bearings begin to fail. Contaminated antifreeze is a common cause of Audi water pump failure. Thoroughly flushing your vehicle’s cooling system is highly recommended. Along with that, be sure to keep an eye on the “weep hole” if you’re in an area that experiences freezing temperatures. Freezing temperatures will require different coolant mixture ratios than temperatures over 32 degrees Fahrenheit. Incorrect coolant ratios have been known to cause the weakening of Audis’ weep holes, which almost always results in a leak.

Audi A6 Engine Issues

Vacuum leaks

Like the A4, vacuum leaks are common with the A6 as well. Be sure to have them routinely inspected to avoid costly repairs down the road.

Carbon buildup on intake valves

This type of buildup is very common with Audi’s direct injection engines. It can lead to loss of performance, misfires, rough idles, and more. Though Audi recommends oil changes every 5,000 miles, we recommend more frequent oil changes and inspections to avoid more costly services down the road. Cleaning each of the vehicle’s valves and reassembling the top end of the engine is an expensive and not-so-convenient service.

Failing timing chain tensioners

Because Audi A6’s have dual overhead cams (DOHC) with 4 valves per cylinder, they have a complex and somewhat confusing system of chains that keep the engine in time. These chains feature hydraulic pistons and plastic guides that often need to be replaced. If these components aren’t replaced in a timely manner, your engine can easily become out of time and need to be replaced entirely. This can happen all within a handful of miles, so we recommend keeping an eye on your vehicle’s timing!

Coil packs

If you notice your A6 running rough or misfiring, there is a strong chance you’re experiencing bad coil packs.

Faulty intake manifold flap motor

If you experience your A6 idling rough upon cold starts, it is likely that you will need to replace the intake flap’s motor altogether. This typically occurs before 60,000 miles.

Audi A8 Engine Issues

Leaking coolant valve

This allows coolant to enter the engine control module and could cause extreme power loss or engine stall.

Leaking valve cover gaskets

A8’s valve cover gaskets typically last about 50,000 miles. If you smell a burning oil smell, it is likely leaking valve cover gaskets. This is especially common on the 4.2L engines.

80k maintenance

At 80,000 miles, it is recommended to replace the vehicle’s timing belt, water pump, tensioner, idler pulleys, thermostat, serpentine belt, brake fluid, and transmission fluid. If your vehicle is out of warranty, or if you’ve recently purchased an A8 that has not had these preventative maintenance services done, be ready to fork up some serious cash.

Timing chain rattle

A timing chain tensioner replacement can be extremely costly, as it requires the replacement of the actual chain as well as the chain guide and other adjacent parts. If you notice a slapping sound due to too much slack, your timing chain system likely needs to be updated.

Audi S4 Engine Issues

Oil cooler failure

This causes oil and water to mix and gather in the expansion tank. Unlike most other engines, the oil cooler is bolted down next to the sump as opposed to under the oil filter housing. This can throw off many inexperienced mechanics.

Failing PVC (positive crankcase ventilation)

If you notice excessive oil consumption, you will likely need to replace your PVC valve. This requires the removal of the vehicle’s supercharger, which can be time-consuming.

Engine mount failure

It is not uncommon for Audi S4’s engine mounts to fail before 50,000 miles, especially if the vehicle is driven hard. Keep in mind, the vehicle’s MMI (multi-media interface) will not display a warning for failing engine mounts. Thus, it’s imperative for your mechanic to monitor the health of your vehicle’s engine mounts routinely!

Audi S5 Engine Issues

Failing fuel pumps

Audi S5’s are notorious for having failing low-pressure fuel pumps as well as high-pressure fuel pumps, which can get extremely costly, especially if they fail on a reoccurring basis.

Failing PVC (positive crankcase ventilation)

As mentioned with the S4, failing PVCs are a known issue with S5s. If you notice excessive oil consumption, you will likely need to replace your PVC valve. This will not require the removal of the vehicle’s supercharger, unlike the S4.

Leaking oil housing gaskets

These issues should be caught during routine and basic services. Some diagnosis may be required to determine if the leak is coming from the filter housing gasket or another area, which can become costly.

Cracking serpentine belts

If you notice a squealing sound coming from the front of your engine, there’s a good chance the serpentine belt is slipping on the engine’s pulleys. Other warning signs include a battery warning light, intermittent power steering assist, and inadequate air conditioning. It’s highly recommended to have your car engine’s belts thoroughly inspected during each oil change to avoid additional and avoidable costs down the road.

Audi TT Engine Issues

Catalytic converter failure

If you notice an unusual smell coming from the engine area of your Audi TT, notice black smoke coming from your exhaust, or if you unexpectedly fail an emissions test, there’s a great chance your catalytic converter is beginning to fail. If the engine is maintained properly, the catalytic converter should last the lifetime of the vehicle.

Ignition coil failure

If you notice your emission light flashing before staying on permanently or cylinder misfires, your TT’s ignition coil could very well be failing. If a little bit of dirt or rubbish gets past the filters and into the vehicle’s injector, the ignition coils almost always need to be replaced.

Leaking camshaft sensors

Damage to the camshaft position sensor reports to the car’s ECU. In other words, because the ECU works with many sensors to keep the engine running as intended, mass airflow sensors and timing belts can also be affected. If a mechanic replaces an Audi TT’s camshaft sensor, the timing belt’s alignment should be closely monitored to avoid any fluid leaks on or near the sensor mounting area.

Leaking valve cover gaskets

Burning oil smells and puddles of oil leaking from the vehicle’s engine often indicate a leaking valve cover gasket. Oil may also be covering other parts of the engine. The corners of the gaskets are the most difficult areas to seal appropriately. Rather than having your valve cover gasket repaired multiple times, contact the Audi repair experts in Raleigh.

Audi RS4, RS5, Rs6, RS7 Engine Issues

Faulty intake manifolds

Like most other Audi models, carbon buildup in the intake manifold is an issue that will need to be addressed consistently. When repairing this issue, one common roadblock mechanics report running into would be the manifold itself sticking on the flaps. Intimate knowledge and experience are required to clean intake manifolds properly, let alone replace them.

Timing chain setbacks

Though guides and tensioners generally aren’t an issue with Audi RS4-RS7, timing chain adjustments are still required in order for the vehicle to operate as intended. These models’ timing chain guides and tensioners are made mostly out of metal paired with internal plastic pieces. Cam adjusters will wear along with the timing chain, which can become costly to repair.

Faulty oil temperature sensors

Oil temperature sensors detect overheated oil or some type of oil-related malfunction.

The main issue when it comes to maintaining Audi RS4, RS5, RS6, and RS7 models is that they require more training and experience compared to the less race-intensive models like the A6 and Q5. Their high-output, powerful engines are a dream to drive and are considered at a higher caliper than other models. Ranging from $85,000 – $120,000 brand new, the saying is true–you’ve got to pay to play!

Audi Q Series Engine Issues

Crankshaft sensor failure

A failing crankshaft typically results in chain skips and causes the vehicle to become out of time. This can be catastrophic if ignored. The likelihood of this occurring drastically increases once the vehicle is driven over 100,000 miles.

Timing chain tensioner failure

Failing timing chain sensors can damage one or more cylinder heads if not maintained properly. As mentioned before, timing chains feature hydraulic pistons and plastic guides that often need to be replaced. If these components aren’t replaced in a timely manner, your engine can easily become out of time and need to be replaced entirely.


Audi A3 Engines

2.0 FSI

2.0 TDI

Audi A4 Engines


1.8 20vT

1.8 T Quattro

2.8 V6 12v SOHC

2.8 V6 30v DOHC

1.8T I4 20v DOHC Turbo


1.8 T

1.8 T Quattro


1.8 TFSI

1.8 TFSI quattro

2.0 TFSI quattro

2.0 TDI

3.2 FSI quattro


2.0 TFSI

3.0 TDI V6

3.0 V6 TFSI (S4)

3.0 TDI V6 quattro

Audi A6


2.7 L turbo 30v V6

3.0 L 30V V6

3.2 24v FSI

4.2 L 40v V8

3.2 24v FSI

4.2 32v FSI

3.0 TD

Audi A7 Engines

3.0 TFSI quattro

Audi A8

4.2 quattro

6.0 (5998 cc) (A8 L)

4.2 quattro (4172 cc) (S8

3.0 TFSI quattro

Audi S4 Engines


S4 2.7 V6 30v Biturbo,


S4 4.2 40v

3.0L Turbocharged V6 FSI

3.0L supercharged V6 FSI

2.7 L V6 30V DOHC biturbo

4.2 L V8 40v DOHC

Audi S5 Engines

3.0 FSI

4.2 FSI

Q3 Engines

2.0 TFSI

2.0 TDI

Q5/SQ5 Engines

2.0 TFSI

2.0 TDI

3.0 TDI

3.0 TFSI

3.0 TDI Quattro

3.2 FSI Quattro

Q7 engines

3.0 TFSI

3.0 TDI

TT Engines

1.8 T Quattro

3.2 V6 Quattro

2.0 TFSI

RS3 Engines

2.5 TFSI

RS6 Engines

4.0 L V8 TFSI Twin Turbo


4.2 L V8 40v DOHC ‘biturbo’

Schedule Your Audi Engine Repair in Raleigh

No one wants to drive an elegant and thrilling Audi that is not running in peak condition due to engine issues. These engine issues result in hindered performance that can leave you stranded. Call 919-948-3444 or complete the contact form below to schedule your Audi’s engine repair in Raleigh with a certified technician.