News

If you ever wondered how VW/Audi made variable cam timing work? Ever had a trouble code for cam timing and didn’t know where to start? How does VVT work in general? How can I test VVT to see if it is working? What is inside a cam phaser? What is a central (4/3) valve? What is a bearing bridge? What do I do when output tests fail?

This article will review a technical help request from a shop for a 2009 Audi A4 running rough and setting fuel trim fault codes.

The following fault codes were stored:

• P0171 System Too lean
• P12A2 Fuel Rail Pressure Sensor Too high
• P0507 Idle Air Control System RPM Higher Than Expected
• P2279 Intake Air System Leak
• P0300 Random Multiple Cylinder Misfire
• P0301 Misfire Cylinder 1
• P0302 Misfire Cylinder 2
• P0303 Misfire Cylinder 3
• P0304 Misfire Cylinder 4

This article and video illustrates the procedure for placing the parking brake in service mode. You will need service mode when repairing or replacing the brakes on Audi A4 8K chassis vehicles.

Symptom

Customer complaint is that vehicle lacks power or does not attain top speed.

Fault code P0299 = Turbo under-boost

The customer’s complaint is that even though the vehicle locked, the alarm keeps going off.

Audi A3 has been developed covering variants and functions for model years 2013 - 2014. This includes dynamic data, module information, fault codes, adaptations and routine functions across the range of drive, body, chassis and infotainment systems.

A secondary air problem is not always caused by the secondary air system. With the engine cold, start engine. If the secondary air pump runs and can be heard, the issue may be in the airflow control side.

Craig Shippy explains how to quickly diagnose fuel pressure fault codes. Things aren't always what they seem.