2020 Subaru Ascent: gas smell in the cabin

Filed May 22, 2026 · PA

I am submitting this complaint regarding a known exhaust manifold/flex pipe failure affecting my 2020 Subaru Ascent Touring (VIN: [XXX] ). My vehicle was diagnosed by a Subaru dealership with a “broken flex pipe on the header” causing excessive exhaust noise and exhaust leak concerns. Repair estimate was slightly over $2,000. After researching the issue, I discovered numerous reports from other Subaru Ascent owners describing identical failures involving cracked exhaust manifold welds and failed flex pipe sections. Subaru has also issued TSB 09-106-23 involving exhaust manifold weld cracking and redesigned replacement components for this issue. Symptoms began in the low 70,000-mile range and progressively worsened before formal diagnosis at approximately 83,000 miles. This appears to be a widespread defect involving emissions/exhaust components. Many owners online report loud cold-start exhaust noise, cracked manifold welds, failed flex pipe sections, exhaust fumes/smells, and expensive manifold replacement repairs. My concern is both the widespread nature of the defect and Subaru’s handling of complaints regarding the issue. Initially, Subaru denied assistance because the vehicle has a branded title. After documentation was provided showing federally mandated emissions-related coverage/extensions were active for this VIN regardless of title status, the denial basis changed to mileage. After explaining symptoms began prior to the mileage threshold, Subaru then cited lack of dealership service history after my ownership despite the vehicle being regularly maintained by a local mechanic. I am requesting the federal safety agency review whether this exhaust manifold/flex pipe defect represents a broader reliability and emissions-related defect trend affecting Subaru Ascent vehicles. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Nov 23, 2022 · Engine, Transmission · CA

Transmission still slipping when accelerating between 20-30mph. Brought car in for recall but it continues to have the same issue. AC stopped working even when leak was fixed. Now smells like exhaust fumes when warming up the car.

Filed Aug 19, 2022 · Fuel system · IN

Pretty much from day 1, Ascent smells of gasoline in the cabin after parking the car either inside or outside, shade or shine, hot or cold, day or night, flat or not surface.. after having parked it. It doesn’t matter if it’s a quick trip or a long one, it can still happen after parking. Fumes come out of the vents up front. The concerning part is we have a toddler, which I suspect the federal safety agency would have an issue breathing in hydrocarbons, let alone any passenger. It doesn’t happen all the time, but when it does it lasts a solid five minutes or so. Mentioned to Subaru at time of CVT recall, not even mentioned they checked it out on my paperwork. I even waited to say anything until our car was broken in and all possible lube/other off-gassing components to stabilize.

Filed Jun 3, 2022 · Engine, Fuel system · WI

When the fan is on there is a strong smell of gasoline in the vehicle. This happens whether the vehicle is in motion OR is idling. The smell of gas fumes is very noticible if the fan for the heater/ac is pulling air from outside the vehicle. When the fan system is re-ciruclating the air from just the cabin, there is no smell. This is a very noticble smell and we have to drive with our windows open. My children are not able to be in this vehicle due to this smell. This is our family vehicle and daily driver. I have to drive this vehicle to work. This vehicle we have called about to multiple dealerships. They want to charge us over $300 dollars, but no one has ever heard of anything like this according to the dealers. The online forums say a completely different story. No warning lights or messages have happened. There has been no change to my gas mileage. We are current on all maintence. We have replaced the cabin and engine air filters, and we have replaced the gas cap to see if this would make a difference. It has not. There is no gas leak to the ground that is noticeable. But there is a faint gas smell in the engine area when the vehicle is running.

Filed May 9, 2022 · Engine, Fuel system · WI

We own a 2020 Subaru Ascent we purchased brand new. A few weeks ago we noticed a faint gasoline smell while at a red light. I thought it was a one time occurrence but it has been happening now every time the vehicle is at idle or stopped. I have read on Subaru owner forums about 2019 to 2021 models having this issue all the way from 2100 miles to almost 90,000 miles. Many customers have had to make multiple trips to the dealership to get charged diagnostic fees and many times they say they can’t smell the problem. I just recently contacted my dealership about this issue and found an old service recall about the low pressure fuel pump and was told to not believe everything I read online. This is the vehicle that my family uses and I’m not sure if this is safe for them to be in and is getting to sound eerily similar to when Ford had the CO problem in their explorer and people were crashing. For the amount I paid for this vehicle and all my service intervals at the dealership and many people having the same safety concern I hope this is investigated and I won’t have to pay for repairs.

Filed May 25, 2021 · Brakes, Fuel system · VA

I bought this car brand new from Subaru dealer in Sterling VA. Starting form first week we start having issues with certain parts. (steering, line assist, unexpected breaking, shaky/wobbly brakes, raw fuel smell in the cabin and around the car.) I took the car may times to dealer to get it serviced however every time I was sent back as they couldn't replicate the issue. In one instance, they found some errors on the front brakes and changed it. After that car still having issues with breaking noise and also shakiness when breaking during high speeds. One of my biggest concern is the raw fuel smell coming into the cabin during idle or low speeds. I have to use the internal air circulation to avoid to bring raw smell from engine to cabin. I also noticed raw smell is also noticeable if you park. front of the car, front passenger and driver sides also have that raw fuel smell. Dealer couldn't replicate the smell however I have some of my friends and family members noticed it without having expert knowledge on the issue. I am thinking, Subaru ascents turbo system might be causing the fuel smell. Either its dangerous for fumes in the cabin and/or it is fire hazard eventually. I also think break problems are due to wrong sizing of the break parts for the size of the car. You can easily feel breaks are having difficulty stopping car when going down hill over 50 miles hr... It starts wobbling. Per master tech in my Subaru dealer, this is normal Subaru Ascent behavior and there is nothing wrong. I don't believe that. Attaching all the documentation I have.

Filed May 16, 2020 · Engine · 1,235 miles · MI

My wife and I purchased a new 2020 subaru ascent in january this year. From day one, the vehicle has been generating an excessive and potent fuel smell in the engine bay that is then pulled into the passenger cabin via the HVAC system while running. This smell is prevalent when walking around the outside of the vehicle while it is running; it is also noticeable after parking (and turning off) the vehicle in our garage as the garage fills with a raw fuel smell that takes several hours to dissipate. We are able to replicate this issue every time we drive the vehicle for more than 10 minutes in all types of driving conditions and trip durations. Outside temperature does not seem to be a factor. The vehicle has been taken into the dealership three times since purchase. On the second visit, the dealership tech verbally confirmed the fuel smell upon check-in and opted to run full diagnostics on the car, even testing the fuel pump/system, but could not identify the source of the smell. This was eventually elevated into a service request incident/ticket with subaru of america. Two subaru field engineers visited the vehicle, the first stated they could not replicate the problem, but the second could replicate the problem but claimed it was a running engine/burning plastic smell and was considered normal operation. The engineer's proposed remedy was to use the "recirculate air" button to prevent outside smells from being drawn into the car. > I am confident this is a fuel smell, not a typical heated engine smell as subaru claims. > when drawn into the vehicle, the fuel smell causes lightheadedness and headaches. > using the recirculate air button is not a solution, it is a mitigation tactic, especially when that smell is continually generated by the running vehicle.

Filed May 3, 2020 · Fuel system · 1,200 miles · NE

Raw fuel smell coming through vents when outside air is being used. More often this occurs when engine is warm and has been restarted (I.e. Short trip). Can experience the smell when the car is stationary or in motion. Smell is enough to cause headache. Dealer couldn't replicate but this happened as soon as I picked up the car from the dealer.