2017 Audi A4 Engine

I experienced similar undesirable engine behavior on two occasions. Upon coming to a stop, the auto start/stop system stopped the engine. Shortly after, when attempting to drive away, the stop/start system attempted to start the engine, but failed; the starter briefly activated to turn over the engine, but the engine did not start and continue running. The car was left in the following condition: Engine off. Gear indicator showing "D". Accelerator pedal unresponsive. Regaining engine power required turning the car off, applying the brake pedal, turning the car on, and selecting "D" with the gear selector. This behavior occurred on two occasions on different days; once on 16 March 2024 and the first time within several days prior. Both occasions occurred before the engine was at full operating temperature, and while the car was on a slight uphill slope. Ambient temperatures were in the high 40's or 50's Fahrenheit. By luck, neither occasion resulted in an unsafe traffic condition.

Start Stop system failures. Upon engine restarting, it stalls instead. This has happened on multiple occasions and the dealer response is to just turn it off every time you start the car. Causes dangerous situations due to inability to move car until full power cycle happens.

2017 A4 B9 premium plus model, AWD, 2.0T. I have had an Audi dealership service my car for all major service intervals outside of oil change, not only at recommended intervals but even early. 3 years ago I had my 40K mile service done at 35K miles. Spark plugs were replaced by Audi Hawthorne in Westchester county, NY. One week ago, at 49K miles (well before the 6 years or 60K miles Audi says their spark plugs will last) my engine seized while driving and was misfiring. This caused an engine shut down WHILE THE CAR WAS IN MOTION on the highway. I was able to restart and make it off the highway where the car seized again. I had to then be towed 30 miles back home. Took it to my locally well known body shop that I have used for years for them to say: 1. My spark plugs were loose and installed incorrectly and 2. The electrode at the top of the plug had broken off TWO SEPERATE SPARK PLUGS and fallen into the engine, causing scoring to the engine and #4 piston as well as blow-by during combustion. They said this had to be caused by a manufacturing defect PLUS incorrect install. they fixed what they could and recommended I take it to Audi. Audi is now saying I need a whole new engine because of damage to piston 4, and not saying they will cover the replacement cost of $21,500. 

The Thermostat and it's house is failing on my of the 2017 audi a4 causing the coolant water to leak which makes the car heat up quickly due to leak and not having sufficient coolant water. So many of the b9 generation of audi a4 owners are also complain about this issue. Audi is charging $2500 to fix this known issue.

Random Engine Coolant Warning. Since purchase of vehicle mid-March 2022, I have randomly received engine coolant warnings on the dashboard. Visual checks of the coolant reservoir reveal no issues. Internet search of issue reveals a number of other owners have had the same problem. Issue has occurred at all speeds and temperature conditions.

anti-freeze started coming out from the bottom of my vehicle... seems like that is a water pump issue, also I seen that I'm not the only person with this same issue with Audi A4... this should be a recall to resolve this problem.... thank you

Symptom of low coolant in overflow reservoir; below minimum line. Pressure test concluded leak in thermostat/water pump part. Appears to be a rampant problem spanning over a decade and affecting multiple trims and redesigns (i.e B8/B9 redesign/updates). Safety put at risk for possible vehicle fire or high pressure damage for engine coolant/radiator. The problem was reproduced and confirmed at a local (non-audi dealership) repair shop. They stated that the low level of coolant was due to a small leak in the thermostat/water pump housing. The vehicle has not been inspected by the manufacturer, police, or insurance. It will soon be in the local Audi dealership for a second opinion and/or possible resolution. I received a warning indicator on the dash and written pop up message on the dash board that indicated low coolant reservoir level. No OBD codes were collected by the independent service shop. They said that non were being displayed or read besides what was displayed on the dash.

My 2017 Audi A4 Quattro is now five years old. There is only 26,000 miles on the vehicle. Mostly local miles. I noticed drops of red fluid on the garage floor under the engine compartment. My mechanic investigated and found the issue to be leaking coolant from the thermostat/pump housing. It is obvious that the leak has been occurring for awhile as there is dried white residue all around this area. The engine cover under the engine compartment was all wet with coolant. The coolant reservoir was also low. The car's information system did not indicate an issue, but I am sure it would have eventually (at probably a very inconvenient time and location ! ). I've noticed several other Audi owners complain about this same issue. This will no doubt be an expensive repair which is totally unacceptable for a car like this with such low mileage.

Coolant leakage and pump problem for engine cooling. Unit was replaced.

I took my car in for a routine check and the dealership noted a potent is coolant /transmission fluid leak. However they said that it could have just been when coolant bubbled over so they decided not to repair anything and to just monitor. The next time I brought my car in my warranty was done and they noted the same issue and told me that I now had a coolant / transmission fluid lead that requires $3,000 to repair. I can clearly see the coolant reservoir tank leaking and upon googling this issue, it looks like a lot of 2017 A4s have the same issue, yet there has been no recall to fix this issue.

CAR LEAKING COOLANT THROUGH THERMOSTAT HOUSING OR COOLANT PUMP

TL* THE CONTACT OWNS A 2017 AUDI A4. THE CONTACT STATED THAT HER VEHICLE WAS LEAKING OIL. THERE WAS NO WARNING LIGHT ILLUMINATED. THE VEHICLE WAS TAKEN TO STEVEN CREEK AUDI (751 SOUTH WINCHESTER BLVD, SAN JOSE, CA 95128, (408)551-4870) TO BE DIAGNOSED. THE CONTACT WAS INFORMED THERE WAS AN ENGINE OIL LEAK LEADING TO THE TURBO CHARGER. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE HOWEVER, NO ASSISTANCE WAS PROVIDED. THE VIN WAS NOT UNDER RECALL. THE FAILURE MILEAGE WAS 26,257.

Significant leaking from water pump and thermostat housing.

This car has a KNOWN issue with the water pump housing leaking well before the expected lifespan of said part/gasket and Audi has not issued a TSB regarding it. It's unacceptable that a luxury car needs such a major repair with few miles (many users are experiencing this well before 40k miles) and if you are out of the original warranty, you're stuck with a $1k+ bill. My car with just about 47k miles on it has been slowly leaking from this part for about a year now and will need to be fixed soon as my coolant level is dropping steadily.

COOLANT RESERVOIR WAS REALLY LOW. FILLED IT RIGHT AWAY BUT IT WENT LOW AGAIN A MONTH AFTER. CONFIRMED FROM OTHER OWNERS EXPERIENCING THE SAME ISSUE.

COOLANT LEVEL WAS LOW SO TOOK IT INTO THE DEALER. THE THERMOSTAT HOUSING WAS LEAKING COOLANT. *TR

CHECK ENGINE LIGHT ONLY CAME ON ONCE AND THAT IS WHEN THE INTAKE MANIFOLD DETECTED A PROBLEM. AUDI REPLACED THE INTAKE MANIFOLD TWO TIMES AFTER NUMEROUS SERVICE VISITS! THE SPUTTER, LAG, OCCURS ALL THE TIME I EVEN RECORDED A VIDEO BUT WAS UNABLE TO BE RECTIFIED.