Vehicle: 2005 Audi A4 Quattro Sedan, V6-3.0L (BGN), Automatic Transmission/Transaxle

Mileage: 84,332 miles

Problem: The owner brought his Audi Quattro to the shop because the malfunction indicator light (MIL) was on, and the engine would die intermittently while driving. The engine always restarted but he never knew when it would die again.

Case Details: The technician connected a scan tool and retrieved the following diagnostic trouble codes (DTCSs):

• P0015 – Advance Camshaft Adjustment, Exhaust, Bank 1
• P0321 – Engine Speed (RPM) Sensor – G28 – Incorrect Signal
• P0322 - Engine Speed (RPM) Sensor – G28 – No Signal

He contemplated replacing the engine speed sensor but wanted to better diagnose the problem to avoid replacing a part that didn’t fix the problem. He called ALLDATA Tech-Assist.

The Tech-Assist consultant suggested looking at TSB #28 09 05 in ALLDATA. The symptoms closely mirrored what the technician was describing. The TSB said that the DTCs and dying problem could be caused by the spacer installed between the engine speed (RPM) sensor and the gearbox. The fix was to remove the engine speed sensor, discard the spacer, then reinstall the engine speed sensor.

Confirmed Repair: After the technician removed the spacer and reinstalled the engine speed sensor, he cleared the DTCs and took the vehicle for a test drive. The engine ran very well, did not stall and no DTCs returned. Fixed!