2019 Subaru WRX STI, reliability, engine failure lawsuit, 2.5-liter engine failure
Denis Flierl's picture

WRX STI Is Least Reliable Subaru; What Is Dragging The STI Down?

Subaru is the #1 Car Brand according to Consumer Reports, but the Subaru WRX STI is the least reliable Subaru in the stable. See what is dragging the STI down.

Subaru WRX STI owners have had plenty to complain about, and it's the 2.5-liter turbo engine that has been dragging the STI down. Even though Subaru tops Consumer Reports overall brand rankings chart this year for the first time ever, the WRX STI gets bad marks for reliability. The Japanese automaker jumped up six spots knocking off last year's # 1, Genesis luxury brand “off its perch.” Consumer Reports says it was Subaru’s strong predicted reliability and owner satisfaction marks that launched Subaru past Genesis, Toyota, Lexus, Porsche, Honda, and BMW. But CR also says the Subaru WRX STI had a much-below-average predicted reliability

Subaru of America (SOA) has been hit with a slew of engine lawsuits recently for the STI 2.5-liter turbo engine that dragged the STI’s reliability down. Subaru has been dealing with four 2.5-liter turbocharged Boxer engine failure lawsuits brought by Subaru WRX STI owners in California, Michigan, and New Jersey and SOA has been trying to prove the turbo boxer engines in 2012-2017 WRX STIs don’t have a design flaw causing catastrophic engine failure.

Subaru WRX/STI owners, contended in the lawsuit, the 2.5-liter turbo engine had a defect which allowed contaminated oil to carry “damaging metal debris through the engines” and Subaru knowingly sold the cars with defective parts that led to engine failure. The motion said, "Plaintiffs alleged that defendants were aware of this engine defect, but failed to disclose it to consumers.”

ALSO READ Subaru Hit With 4th WRX/STI Lawsuit Claiming Dealers Installed “Secret Software”

The Camden, N.J. automaker recently settled the lawsuits, but Subaru of America is denying any wrongdoing but wanted to settle so they can move on. Subaru agreed to reimburse all class members for 100 percent of all out-of-pocket expenses they incurred for parts and labor that they paid to a Subaru dealer for the cost of a qualifying repair performed during the extended warranty period.

The settlement covered 2012-2017 Subaru WRX and WRX STI vehicles manufactured between Oct. 11, 2011, and Nov. 16, 2016, equipped with an EJ25 2.5-liter turbocharged Boxer engine with bearing vehicle identification numbers ending with CG203168 and up for five-door hatch models and CG006225 through H9826807 for four-door sedan models.

Even though the Subaru WRX STI performance sedan is the least-reliable vehicle in Subaru’s all-wheel-drive stable because of its EJ25 2.5-liter turbocharged Boxer engine, it wasn’t too much to keep the new 2019 Subaru Ascent, Forester all-wheel-drive SUVs from pushing the brand to the #1 Best Car Brand ranking in 2019.

Leave your comments below, share the article with friends and tweet it out to your followers!

Follow all Subaru WRX STI news on FacebookTwitter and Instagram

Photo credit: Subaru USA

Subscribe to Torque News on YouTube.

Follow Torque News on YouTube, Twitter and Facebook.


Some of that is people beating on their cars but yes the ej has had it's fair share of issues. My last STi made it to 70k of problem free stage 2 miles. I hope my 2019 with updated internals stays problem free.
They cut costs when they quit using forged pistons and became oil burners. Fun car, but very first thing I'd do is replace pistons, rings, rods straight off showroom floor.
I bought the 2018 STI on OCT 2017. I would like to check if the issue with the engine has been solved or if I need to do anything else to prevent a major failure. For starters, I change the oil every three thousand miles instead of every six as recommended. I haven't done any engine mods. However, I would replace the oil pump if needed and also install an air-oil separator, also if required. So far my car has behaved much better than my previous 2015 WRX with the FA-20 engine which showed the check engine light on numerous times. The 2018 STI not a single issue so far.
Well I went and bought the Subaru STI ra number 323 antedate with only 1,500 miles on it I absolutely love the car and have no problems. Every one whines about how limited the power is but until you drive and feel how tight the car handles and try it on the track with the braking people are missing awesome handling car. Besides all you do is put an access port on it from cob and you have a 340 horsepower car
Accessport's OTS tunes will not increase the power that much. It'll adjust your throttle mapping and get you to the tuner for your custom tune after you install some aftermarket parts, but dont count on any noticable difference aside from the throttle response.
Also I'd like to add that I experienced zero issues with the STI until around 40 or 45k miles. It then began burning approx. half a quart between 5000 mile oil changes and slowly increased oil consumption over time. Then, at 60k, catastrophic engine damage. Added an AOS at 50k and made no difference. Even if you keep the car stock, it will burn oil eventually. Fun car, but the engine internals are a weak link, and a major one at that.
Well the RA has different and stronger internals.i think it's how you treat your car. I just traded in my 12 sti wagon and the car ran mint. No oil burn. Accessport smoothed out the driving. I think the Ra Will be a diff.car and I think Subie has problems with only a few yrs.i still stand by them and will until I have issues. There's too much neg.written about them and I think people jump before they look...
I just got the new 2019 STI. I would deffinitly like to know if the issues from previous years have been fixed and if I get the COBB tuner what upgrades to put on to notice a difference
Tune twix program add aftermarket parts and run them hard your going to pay high-performance is not for the right lane driving lets face it folks even porsche owners have there isues alot..not just wrx /sti your not driving Grand Dads chevy.