Audi S4 Parking Heater Failure: Repair Guide & Costs

Faced a similar issue on my 2009 Audi A6 3.0 TFSI. The auxiliary heater failure often stems from the glow plug system, which is a serious but fixable problem. The climate control unit would throw error codes, and the temperature sensor readings were inconsistent. When the heater core fails to activate, checking the glow plug and its connections should be the first step. The blower motor worked fine in my case, just like yours, which helped narrow down the problem. The repair required: Complete glow plug replacement, Cleaning fuel lines to auxiliary heater, Testing temperature sensor connections, Recalibrating climate control module This was not a quick fix, took 2 full days at the workshop. The issue needs proper diagnosis because similar symptoms can come from multiple failing components in the heating system. If left unattended, it can lead to complete auxiliary heater failure. Common causes for these Audi models include: Faulty glow plug, Clogged fuel lines to heater, Damaged wiring harness, Control module malfunction Worth having a specialized Audi technician look at it, as general mechanics often miss the auxiliary heating system complexities in these models.

That glow plug issue sounds exactly like what I dealt with on my S4 last winter. After they diagnosed and fixed it, no more error codes or startup problems with the auxiliary heater. Out of curiosity, did you track what you paid for the full repair? Mine also involved the blower motor which needed cleaning during the job due to debris buildup. Makes me wonder if any other issues popped up since getting it fixed?

Good news, got the glow plug problem fully resolved by a qualified technician. The car heater works perfectly now with no error codes showing up. Total repair cost came to 440 Euro for the glow plug replacement and necessary diagnostics. The climate control system has been functioning flawlessly since the fix, no additional issues with the ventilation system or auxiliary heater. This repair actually proved more straightforward than initially expected, though finding the right mechanic made all the difference. Unlike your case, my blower motor was clean and didnt require any extra work. The heat control has been consistent through all settings since the repair. Looking back, getting it fixed immediately was the right call to prevent more extensive damage to the heating system components.

After struggling with my heater problems, I finally found a reliable mechanic who specializes in Audi heating systems. The entire process went much smoother than my previous repair attempts. They diagnosed the glow plug issue and fixed the auxiliary heater in just one day. The total repair bill came to 650 Euro, which included: New glow plug installation, Heating system diagnostic, Temperature sensor check, Climate control calibration The ventilation system works perfectly now, and the car warms up quickly even in cold weather. No error codes since the repair. Really glad I didnt delay getting it fixed, the mechanic mentioned waiting could have damaged other components. Definitely learned my lesson about finding the right specialist rather than going to general repair shops. The expertise made a huge difference in both repair time and quality.