Audi A4 B9 Workshop Manual. Wiring diagram

Audi A4 (B9/8W) 2015-2023 Service Repair manuals. Color wiring diagrams, engine and transmission diagnostics/repair, error codes, fuse and relay locations. The manual can be downloaded in PDF format for free.

  • Audi A4 B9 (8W2) 2016 -
  • Audi A4 Avant B9 (8W5) 2016 -
  • Audi A4 Allroad B9 (8WH) 2016 -

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Audi A4 (B9/8W) 2015-2023 Wiring diagrams

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Audi A4 B9

In 2015, when the fifth generation Audi A4 debuted, many fans were disappointed. The novelty turned out to be actually the deepest restyling of its predecessor


Now the line of engines was opened by engines with a volume of 1.4 liters. Although in fact the update came out much more ambitious than it might seem initially. So the aforementioned 1.4 engine gave way to a new two-liter one, and only the hood and roof remained of the previous body parts. At least the novelty is preferable in terms of electronics in the back of the B9 cars are less problematic. And in the previous generation, numerous shortcomings were eliminated by numerous flashing.



The most popular were cars equipped with the same downsized 1.4-liter engines of the ea211 family; they accounted for more than 60 percent of sales of pre-styling cars. And this is a good choice for the release of the fifth generation of the Audi A4, most of the most critical problems have been successfully eliminated.


The most serious jamb of those that remained after numerous upgrades was the jamming of the thrust of the turbine bypass valve actuator, the so-called wastegate. Due to the fact that the electric drive here is quite powerful, it breaks the jammed traction. If the diagnostic scanner shows an error p334 b00 - a mechanical malfunction of the boost pressure regulator, know this is it.

It is almost impossible to predict the mileage at which this can happen, there are examples when the wedge occurred at a very meager mileage and there is an unconfirmed, but quite logical explanation for this, most likely with a purely urban operation of motors, there are not enough gaps along the highway at high speeds.

But antifreeze leaks at the junction of the water pump and the housing are treated by replacing the penny gasket. Let me remind you that the 2011 engines have an intricate design, consisting of a dual-circuit cooling system pump, as well as two thermostats docked to it. In its current form, this whole heaped ingenious unit serves without problems somewhere up to 200 thousand kilometers. With the restyling, Audi minders were forced to completely abandon the 1.4 tfsi engines. Moreover, the decision was lowered from above, so Skoda, Seat and Volkswagen began to switch to the new 1.5 turbo engine.

In 2018, the company presented an updated line of diesel engines. These motors have an aluminum block, steel sleeves and other modernized constructs.



The line of gearboxes by modern standards, the B9 family got almost perfect, almost the only malfunction that can happen with the MQ350 manual gearbox familiar to any serviceman is the replacement of a dual-mass flywheel after overcoming the 150,000th milestone.



Let's start our discussion of the Audi A4's suspension with a warning about ride. Each instance of the Audi A4 will be completely individual, because there are four chassis options at once: standard, sports, adaptive, and also for bad roads.

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