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Audi A4 B7: General Info Audi Quattro Reliability

Driving enthusiasts are talking about the reliability of the Audi A4 B7. Keep reading to learn what they have to say.

By Charlie Gaston - March 23, 2016

This article applies to the Audi A4 B7 (2004-2008).

If you're wondering about the reliability of the Audi A4 B7, then this article was written with you in mind. When defining reliability, we mean how well the A4 in particular, the major systems, as well as the wiring and electrical equipment that power this aggressively manufactured automotive machine consistently perform in relationship to the specifications of the vehicle. Moreover, we want to examine whether an A4 with a good number of miles on the odometer will hold up over time. While we know each vehicle is unique, possessing its own history, it's still important to thoughtfully consider how reliable the A4 has proven to be to other Audi drivers in the past, and what that information might mean to you. Let's get started!

Audi A4 B7

Valves and Pistons

The valves and the pistons in the A4 are manufactured to occupy the same volume within the engine cylinders. This is done on an alternate basis as part of an "interference" design that was put in place to ensure high performance on the road.

Figure 1. Upgraded pistons are available.

Timing Belt

A high performance timing belt aids in the synchronization of the movements. If the timing belt is not well maintained and failed, a number of engine components are at risk for severe damage, resulting in high repair costs. It's highly recommended that all A4 owners have the timing belt in their vehicle replaced every 70,000 miles. Used cars that approaching the 70,000-mile mark should be checked for the most recent, if any, timing belt replacement.

Figure 2. Schedule a timing belt change as needed or at around 70,000 miles.

Overall Assessment of Reliability

Thanks to an enhanced motor, the A4 is manufactured to deliver reliability. The vehicle's six cylinders receive rave reviews from current owners and the drive is said to be "excellent." The B7 platform is particularly popular among owners, with many citing it as a "visually different" machine to its predecessor, the B6. This assessment centers largely on several key areas, including, but not limited to, the aggressive styling profile, excellent driving dynamics and all-around smart multimedia and navigation system of the B7.

Figure 3. The Audi A4 delivers on reliability.

Common Questions

What is the one maintenance repair I should never skip?

In truth, never skip any maintenance repairs. However, having your timing belt replaced early is a very good idea. As well, you will want to replace your engine oil every 5,000 miles, particularly in an oil-cooled turbocharged vehicle such as the A4.

Does high mileage impact reliability?

Not necessarily. Generally speaking, as long as an A4 is properly cared for, it will continue to deliver a high level of reliability, even as the miles stack up on the odometer. Simply put, the A4 is a well-engineered vehicle.

How does Audi's quality control compare to the BMW?

The quality control of the A4 is generally thought to exceed that of the BMW. This is largely due to an unprecedented expansion in quality control tests brought on by Audi across all of its factories around the world.

Common Issues

Camshaft Lobe Follower

The camshaft lobe follower found on the high pressure fuel pump runs a risk of becoming worn down, resulting in a necessary (and immediate) repair.

Ignition Coil Failure

A faulty ignition coil can cause backfiring, brought on by extra fuel in the exhaust system. Check your spark plugs for damage, as they are likely to show some sign of damage.

Bad Water Pump

The Quattro B7 is known to have a bad water pump. Common signs of a bad water pump include puddles of coolant underneath your vehicle or overheating. Replace a bad water pump as soon as you detect the problem to avoid severe engine damage.

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