| 1 | 0 | 3 | 4 | 3 | 4 |
2009 Audi A4 / S4 / RS4 repairs by problem area
Engine (40%)
Transmission and Drivetrain (2%)
Brakes and Traction Control (3%)
Suspension and Steering (13%)
Electrical and Air Conditioning (23%)
Paint, Rust, Leaks, Rattles, and Trim (15%)
Other (3%)
Select a problem area
- Engine
- Transmission and Drivetrain
- Brakes and Traction Control
- Suspension and Steering
- Electrical and Air Conditioning
- Paint, Rust, Leaks, Rattles, and Trim
- Other
Chart based on 542 repairs.
2009 Audi A4 / S4 / RS4 electrical repair cost distribution
$2500+ (5%)
$1000 - $2499 (8%)
$500 - $999 (8%)
$100 - $499 (19%)
< $100 (60%)
Chart based on 97 repair trips. The repair cost chart excludes repairs made under warranty, do-it-yourself repairs, and repair trips that include maintenance.
2009 Audi A4 4dr Wagon
turbocharged 211hp 2.0L I4 7-speed automated manual AWD
| 53320 mi A $765 |
door lock failed, replaced door lock |
| 57660 mi A $1600 |
side assist sensor replaced |
2009 Audi A4 4dr Wagon
turbocharged 211hp 2.0L I4 6-speed shiftable automatic AWD
| 22000 mi | Wipers totally stopped working. On second occassion, took to dealer. Was a wiring harness/or relay. Replaced. Also the driver's sun visor wouldn't say put, replaced. |
| 130000 mi US $525 |
Battery not charging. Alternator tested as failing, replaced. |
| 2500 mi | Loose Fuel Sending unit connection, resulting in "Fuel Level indicator showing EMPTY. Connection secured and problem resolved. Loose Fuel Sending unit connection, resulting in Fuel Level indicator showing EMPTY. Connection secured and problem resolved |
| 60000 mi US $280 |
A temperature/pressure sensor failed and had to be accessed for replacement. |
| 109000 mi US $1100 |
Replaced blown left xenon headlight bulb. |
| 142000 mi US $30 |
Replaced the display screen |
| 14560 mi | Blown and short circuited high end (manufacturer installed) Bang and Olufsen amp for stereo system. Parts flown from NY to LA to Vancouver to Calgary. hadn't realized this sound system was so rare and expensive. Too bad for Audi and B&O. |
| 16120 mi | Failure of MMI software after previous AMP replacement - software updated. |
| 94240 mi C $15 |
replaced bulbs |
| 41000 mi | Air bag light. Was previously repaired by a different dealer who said they replaced the airbag. Came on again after 3 months, current dealer replaced airbag again, still not fixed, then electronic airbag control module. Backordered. |
| 127000 mi US $4000 |
horn not working. Lots of hours of diagnosis.Turned out to be wiring problem and module problem. Now working. |
| 39000 mi | Rear hatch motor malfunctioned. Replaced under warranty. |
| 34300 mi US $18 |
PROBLEM WITH SEAT BELT SENSOR AND AIR BAGS |
| 26000 mi US $6 |
Replaced rear right brake light/turn signal |
| 52000 mi US $20 |
Replaced HID headlight on right side after getting dipped right headlight error message |
| 51460 mi C $85 |
Convenience key (keyless lock/unlock) fail. |
| 67580 mi C $50 |
Headlight washer jets do not work. Failure to extend from bumper below headlight. |
| 72540 mi C $50 |
Hood latch switch (electrical) failed. |
| 89680 mi C $200 |
Driver side door keyless entry does not work in cold weather. Sensor is good, actuator freezes. |
| 91760 mi | Driver door window up/down switch intermittent |
| 5580 mi | ipod interface (AMI) is causing my ipod to lock up and requires a reset to continue working. There is apparently a firmware update that is currrently unavailable in Canada. Problem is intermittent and says "Device cannot be read" |
| 11780 mi | problem replicated, ipod cable replaced. Worked for a few days and locked up again. Dealer is working on new solution |
| 29000 mi | Both electrical panels for lights in back of car failed and needed replacement. Panels lights include brake, turn signal, and parking. Both electrical panels for lights in back of car failed and needed replacement. Panels lights include brake, turn signal, and parking |
| 9000 mi | amplifier module short, right front speaker short. |
| 33000 mi | Vehicle would not start. Comfort/convenience module faulty. R&R module, reprogram keys. |
| Continuing electrical problem. Final determination was that the turn signal module was causing the audio amplifier to turn back on after the car was shut off. | |
| 25000 mi | Backup camera not working properly. Tightened cable. |
| 28500 mi | Backup camera not working again two months later. Cable replaced. Fixed problem |
| 49300 mi | A/C & heater blower motor controller was not working properly. Fan would come on only slightly or not at all. Replaced with new blower controller but it didn't work either. 2nd time around the new part worked. |
| 66000 mi US $150 |
Lock sensor on exterior of door (for keyless entry/exit) was not working |
| 72000 mi US $1500 |
Keyless door locking and unlocking not working Headlights not rotating up into position |
| 53000 mi | Stereo module in trunk would not turn off after turning off the car. It would drain the battery completely after a few days. Module replaced. |
2009 Audi A4 4dr Wagon
supercharged 333hp 3.0L V6 7-speed automated manual AWD
| 66220 mi $400 |
Battery worn out, time and wear |
2009 Audi A4 4dr Sedan
turbocharged 211hp 2.0L I4 8-speed shiftable CVT FWD
| 50220 mi C $600 |
Compressor needs repacement |
| 119000 mi US $850 |
Alternator bearing worn out causing noise. Alternator assembly replaced. |
| 121000 mi US $1500 |
A/C stopped cooling. Internal issue with AC. Replaced |
| 20000 mi | Cruise control would not engage or respond. The cruise control switch was replaced. |
| 7000 mi | back right open/close window button comes loose and pops out |
2009 Audi A4 4dr Sedan
turbocharged 211hp 2.0L I4 6-speed shiftable automatic AWD
| 46000 mi US $3000 |
Air conditioner enclosure leaking - water pooled on floor. Replaced the enclosure and the fan control module. |
| 24000 mi | door locks dont function with audi advanced key |
| 26000 mi | Door handles replaced |
| 63000 mi | passenger outside mirror not heating up with defrost on |
| 23000 mi | Radio sound issues. Would cut in and out and was not clear. Bang and Olufsen system as well. Amp was replaced, but did not fix the problem. Air conditioning fan whistles. Less frequent, but still happens |
| 28000 mi | Sound cutting in and out. Was told that it is the DSP system in the Bang and Olufsen sound system. New antenna installed. Problem is only slightly better. |
| 36000 mi | My air conditioning was whistling. Had been repaired before and had come back again. Dealer could not replicate so no repair was completed. |
| 32640 mi | Car displayed "Ignition lock defective" message on cold mornings. |
| 71500 mi US $100 |
Headlights replaced. |
| 42500 mi | Center rear break light failed |
| 66000 mi US $400 |
Ac not working, they replaced high pressure vavle. Did not fix the problem and asked for $250 more for additional diagnosis. Refused and I am driving a car without ac. Will not take it back to dealer. |
| 114000 mi | I never had the A/C fixed. The quoted price was $3K and the dealership told me it may not last very long if fixed. |
| 116700 mi | Alternator. |
| 23000 mi | Door locks failed and were repaired |
| 52000 mi US $85 |
Cruise control wouldn't work. Dealer replaced steering column stalk. Now works as it should. Fuel filler door servo intermittant. Replaced servo under CPO. |
| 84700 mi US $450 |
Front passenger door wouldn't lock. Diagnosed as needing a new actuator. Actuator replaced. |
| 117000 mi US $70 |
Passenger side HID lamp burned out. Replaced both bulbs. |
| 42000 mi | Center rear brake light was intermittently giving a signal that it was burnt out but wasn't. The dealer replaced the rear center brake light assembly. |
| 55000 mi US $222 |
Battery died |
| 14000 mi | Proximity sensor for keyless entry failed for second time in a couple of months. Both rear door handles had to be replaced. That repair caused the inner door handle to fail shortly after picking the car up. Now need to return for that repair! |
| 30000 mi | TPMS sensor on one wheel bad. |
| 2000 mi | Comfort access door handle sensor failure Comfort access - door sensor replaced |
| 18000 mi | Replaced drivers door handle due to internal short for keyless access. |
| 74000 mi US $2830 |
Replace faulty blower motor and switch |
| 7000 mi | Static in rear speaker, new part ordered and replaced by dealer under warranty. |
| 58000 mi US $350 |
Replaced battery |
| 6000 mi | The electronic sensor in the door handle which activates when the key fob is near to open the door quit accepting signals. The whole door handle has to be replaced so part was ordered, has to be painted, and then installed on car at another date. |
| 6000 mi | Sensor in door handle to unlock the doors as you approach with the key fob. |
| 30000 mi | Keyless proximity sensor on the door handle failed for the second time-but on a different handle but if one fails they all don't work. |
| 72000 mi US $1000 |
Battery was in excess of 5 years old and was starting to lose its charge |
| 32000 mi | Side assist malfunction. |
| 41700 mi | Battery died again, dealership replaced headlights, battery, instrument cluster and a bunch of other things. |
| 32000 mi | Have been receiving Audi Side Assist system faulty messages constantly. Dealer updated the software per Audi TSB. Have been receiving Audi Side Assist system faulty messages constantly. Dealer updated the software per Audi TSB. |
| 37000 mi | Side Assist System fault, button was replaced. |
| 31500 mi | MMI system drops bluetooth and radio mysteriously comes on by itself. This appears to be a common problem with the A4s that Audi wont fix without error codes. Resolved itself. |
| 42000 mi | Navigation system controls became erratic. Dealer wanted $125 just to evaluate the problem, with the likely repair hundreds of dollars more. Outraged, I decided to buy a portable GPS system instead. |
| 52000 mi US $1227 |
Replaced water pump. |
| 54000 mi | Nav controls had become erratic. |
| 8680 mi | Side assist warning of cars in blind spot that were not there ! |
| 68000 mi US $350 |
Needed to replace the right front headlight assembly. |
| 90520 mi C $990 |
Front Right Passenger Door Actuator lock failed and had to be replaced |
| 8060 mi | Fuel gauge was reading empty after filling up the gas tank to full |
| 8000 mi | rt side rear view mirror bulb assembly was faulty |
| 33000 mi | Passenger side seatbelt latch sensor failed.It tripped multiple dash warning lamps. |
| 135000 mi US $250 |
Car was blowing hot air. AC leak was repaired. |
| 24000 mi US $95 |
AC threw a fault, but software update was required. Updated software for free. |
2009 Audi A4 4dr Sedan
turbocharged 211hp 2.0L I4 6-speed manual AWD
| 68200 mi C $400 |
rear headlight level sensor broke. needs to be replaced. |
| 95000 mi US $400 |
right reat door sensor for convenience locking system bad, which caused rest of sensors not to work. |
| 68000 mi US $85 |
Replaced gas tank cover actuator. |
| 97000 mi US $2500 |
Alternator burned out. |
| 15000 mi | HVAC smells like mold or mildew when the AC button is active. Dealer replaced filter as part of 15k service and hoped this would fix. Offered to deodorize the system but not under warranty. Disappointing as this has happened since ~ 5k miles. B&O Speakers in the front doors rattle when listening to Sirius talk radio, particularly male voices. Easy to duplicate but dealer claimed they were unable to do so. I'll revisit them in person to demonstrate the issue. |
| 51460 mi A $180 |
Driver's door sensor and fuel cover sensors were replaced. Keyless entry system had stopped working properly. |
| 52700 mi A $200 |
Battery died and replaced |
2009 Audi A4 4dr Sedan
turbocharged 143hp 2.0L I4 Diesel 6-speed manual FWD
| 6000 mi | Whilst being driven, car electrics cut out, engine/power steering kept running, but airbag/ABS/Engine management light came on, rest of display went blank, indicators etc electrics failed. Audi: faulty alternator & gear position switch |
2009 Audi A4 4dr Sedan
265-horsepower 3.2L V6 6-speed shiftable automatic AWD
| 14260 mi | Fuel door release servo was intermittent from convenience locking with keyless system; worked always with key fob unlock. Slight inconvenience. |
| 15380 mi | One keyless door sensor would not lock the car. |
| 14880 mi | Air bag sensor is on. faulty switch in passenger seat belt clasp |
| 47840 mi C $250 |
Warning indicator lights randomly turning on |
| 105000 mi US $1400 |
AC Compressor had totally died. Required complete replacement |
| 20460 mi | Complete failure of battery, transmission shifting issues, navigation systems freezing. None were solved. In fact, a software update was performed that caused some significant cold engine idle issues when first started. |
| 20460 mi | Car sold partly because battery kept totally discharging after three days. |
| 22000 mi | Driver's door window control for driver's door window would not work for the full roll down feature and became very hard to press. Switch replacement fixed it. |
| 47000 mi | passenger seat power adjustment was not working. Dealer replaced power seat motor under warranty. |
| 125000 mi US $900 |
Airbag light on dash came on and cruise control stopped working. Repair shop said that the airbag control module was not working and needed to be replaced. Airbag control module was replaced and system was reset; everything working well now. |
| 139000 mi US $250 |
replace right LED light; headlight failed indicator kept going off |
2009 Audi A4 2dr Convertible
255-horsepower 3.1L V6 6-speed shiftable automatic AWD
| 48000 mi US $650 |
1. problem with tires after 16,000 miles - loud noise and vibration. Car had new tires and aligment in January. Original dealer would not help. 2. NAV DVD would not eject - Original dealer would not help. Had to take car to new dealer |
| 78200 mi US $745 |
Cruise control stopped working. Replaced cruise switch. |
| 79000 mi | Cruise control stopped working 1 week after switch was replaced. Called dealer and they will charge for second repair even though they repaired 1 week prior for $500. Decided not to fix at this time did not want to spend more $ |
| 64200 mi US $1300 |
Installed switch and control unit for cruise control |
| 88000 mi US $209 |
Windshield washer pump replaced |
| 129300 mi US $3100 |
Insulation/coating for wires to headlights "rotting". had to replace front headlight harnesses |
2009 Audi A4 / S4 / RS4
turbocharged 4-cylinder diesel manual 2WD
| 2000 mi | Advance key option allows the car to be locked and unlocked keylessly by sensors in the door handles. A sensor in one handle showed up as faulty, causing an intermittent problem whereby the sensors do not work correctly. Ordered part. Part installed, but problem quickly returned. Made another appointment to repeat diagnosis. |
| 2000 mi | Overall, 2 faulty door sensors causing problems with the advanced keyless entry system which were diagnosed on two separate visits. Now everything seems to be working correctly. |
| Car reporting low battery after only 1 year and even though car is used regularly. Garage said no problems with battery or alternator, told they had fully charged the battery. Two days after previous visit after being told battery had been fully charged and no problem could be found, car reporting low battery again. Took back to dealer who updated software and also ordered a replacement battery monitor/sensor. Battery monitor/sensor arrived and replaced. Advanced keyless entry system not working for the 3rd time (2 original door sensors had already been replaced). 1 of the remaining two original sensor was now faulty, sensor replaced. |
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