Scenario library
Each scenario pairs a curated vehicle configuration with an independently modeled failure, so the same vehicle can present many different problems.
Rough Idle & Check Engine Light
2018 Honda Accord · 2.0L Turbo I4 (K20C4)
“The engine started running rough yesterday. The check engine light came on and it feels worse when I'm sitting at a red light.”
Run diagnosis · ~12 minFlashing MIL Under Acceleration
2015 Ford F-150 · 5.0L V8 (Coyote)
“It stumbles bad when I get on it with a load in the bed, and the light flashes at me. At idle it's mostly fine.”
Run diagnosis · ~15 minSteering Wheel Shake When Braking
2012 Toyota Camry · 2.5L I4 (2AR-FE)
“When I brake coming off the highway, the steering wheel shakes in my hands. It's fine if I'm braking slow around town.”
Run diagnosis · ~9 minBattery Light and Dim Headlights
2019 Chevrolet Silverado 1500 · 5.3L V8 (L84)
“The battery light flickers on when I'm idling and my headlights go dim. It's already died on me once in a parking lot.”
Run diagnosis · ~11 minSlipping On the 2–3 Upshift
2016 Honda Odyssey · 3.5L V6 (J35Y)
“When it shifts out of second the engine revs up before it catches. It's been getting worse and now it feels like it slips every time.”
Run diagnosis · ~14 minHarsh Engagement and Judder
2017 Nissan Altima · 2.5L I4 (QR25DE)
“It shudders like driving over rumble strips when I accelerate gently around 40 mph, and it bangs into gear when I put it in Drive.”
Run diagnosis · ~15 minDriveline Vibration Above 45 MPH
2018 Jeep Wrangler · 3.6L V6 (Pentastar)
“There's a vibration in the floor that starts around 45 and gets worse the faster I go. New tires didn't fix it.”
Run diagnosis · ~13 min4WD Won't Engage, Clunk on Turns
2016 Ram 1500 · 5.7L V8 (HEMI)
“I push the 4WD button and the light just blinks and never stays on. There's also a clicking sound when I turn hard into my driveway.”
Run diagnosis · ~14 minPulls Right With Inner Tire Wear
2017 Subaru Outback · 2.5L H4 (FB25)
“It drifts to the right if I loosen my grip, and the front tires are shot on the inside edge after only 18,000 miles.”
Run diagnosis · ~13 minHeavy Steering and a Groan at Low Speed
2014 Honda Civic · 1.8L I4 (R18)
“Parking is a workout now. The wheel is heavy and it makes a groaning noise when I turn it all the way.”
Run diagnosis · ~11 minABS Light On, Pedal Drops at Low Speed
2015 Toyota Corolla · 1.8L I4 (2ZR-FE)
“The ABS light is on and sometimes when I'm almost stopped the brake pedal drops and buzzes like it's doing that anti-lock thing on dry pavement.”
Run diagnosis · ~13 minLong Pedal and Fade Down Grades
2016 Ram 1500 · 5.7L V8 (HEMI)
“Coming down the pass with the trailer, the pedal went almost to the floor and the truck barely slowed. After it cooled off it felt normal again.”
Run diagnosis · ~14 minDead Battery Every Few Days
2016 Chevrolet Cruze · 1.4L Turbo I4
“If I don't drive it for two or three days it won't start. The last shop put in a new battery and it did it again.”
Run diagnosis · ~15 minMultiple Warning Lights and No Communication
2019 Ford Escape · 1.5L Turbo I3 (EcoBoost)
“Half the dash lit up at once — ABS, traction, power steering, everything. It drives, but the shop said their scanner couldn't talk to it.”
Run diagnosis · ~16 minA/C Blows Warm at Idle
2016 Hyundai Sonata · 2.4L I4 (Theta II)
“The air conditioning is cold on the highway but as soon as I'm stuck in traffic it turns warm. Then it cools again once I get moving.”
Run diagnosis · ~13 minCold Air on the Driver's Side Only
2019 Ford Escape · 1.5L Turbo I3 (EcoBoost)
“My side blows cold no matter what temperature I set, but the passenger side gets hot just fine. There's also a clicking behind the dash when I first start it.”
Run diagnosis · ~11 minCoolant Disappears, No Puddle
2021 Ford Explorer · 3.0L Twin-Turbo V6
“I have to add coolant every couple of weeks and nobody can find a leak. Sometimes there's white smoke out the tailpipe when it first starts.”
Run diagnosis · ~16 minP0420 After a Parts-Store Fix
2016 Hyundai Sonata · 2.4L I4 (Theta II)
“Light came back on. Another shop put in two oxygen sensors and it lasted about a week. I need this to pass inspection.”
Run diagnosis · ~15 minCVT Shudder Under Light Throttle
2017 Nissan Altima · 2.5L I4 (QR25DE)
“Around 40 miles an hour it feels like driving over rumble strips, but only when I'm barely on the gas. If I press harder it goes away.”
Run diagnosis · ~14 minWhine That Changes With Speed
2017 Subaru Outback · 2.5L H4 (FB25)
“There's a whine that starts around 45 mph and gets louder the faster I go. It's the same whether I'm on the gas or coasting.”
Run diagnosis · ~13 minClunk Over Every Bump
2014 Honda Civic · 1.8L I4 (R18)
“Every time I go over a bump or a manhole cover the front end clunks. It sounds like something's loose under there.”
Run diagnosis · ~11 minPulls Right When Braking
2018 Honda Accord · 2.0L Turbo I4 (K20C4)
“When I brake hard the car pulls to the right. There's also a burning smell after I drive on the highway.”
Run diagnosis · ~12 minNo Ready Light, Everything Else Works
2020 Toyota Prius · 1.8L I4 Hybrid (2ZR-FXE)
“The dash lights up, the radio works, but the READY light never comes on. It just sits there with a red triangle.”
Run diagnosis · ~18 minA/C Cold Some Days, Warm Others
2019 Ford Escape · 1.5L Turbo I3 (EcoBoost)
“Some mornings the air conditioning is ice cold. Other days it blows warm the whole trip. Nobody can catch it doing it.”
Run diagnosis · ~13 min