Read two clearly unverified owner reports and the diagnostic questions they raise, without treating anecdotes as verified fixes or vehicle-wide failures.
These reports show the questions owners asked. They are not independently diagnosed failures, repair-success evidence or fault-rate data.
This reference supports the stated topic only. Model, model year, equipment, current rule or individual vehicle conditions may differ; check the original source before acting.
Read the Reddit r/Subaru_Outback original: EyeSight disabled and Check Engine Light discussion Source date: document date not recorded; research checked: 2026-11-01.
Subaru Outback: several warnings together
A self-reported 2022 Outback thread described EyeSight becoming unavailable alongside a check-engine light and a reported P26A3. The reviewed discussion did not establish a final repair. A Subaru thermal-control bulletin in the research set has a different captured year scope; this report does not extend that bulletin to the 2022 vehicle.
The useful owner action is to save every dashboard message and a full-system scan, then check the exact year and engine with a qualified shop. A disabled driver-assistance feature should not be relied on until the condition is understood.
Chevrolet Malibu: P0420 after parts replacement
A self-reported 2011 Malibu thread described P0420 persisting after exhaust and sensor work, with other oxygen-sensor-related codes listed. The reviewed thread does not prove which repair was correct or that any named part was defective. It does illustrate why replacing more parts without a system test can leave the original condition unresolved.
A shop should review the complete code set, exhaust integrity and fuel-control evidence. The vehicle year, engine and prior repair details matter. This one report cannot establish a common Malibu failure or a typical repair cost.
Other discussion leads in the supplied research plan
These six links are question leads from the supplied plan, not verified repair outcomes. The exact post, vehicle scope and any later update need a fresh source review before they become a case guide.
- Subaru Forester: EyeSight and check-engine questions — preserve the complete code and vehicle details; check a current manufacturer source before drawing a conclusion.
- Ford F-150: cam phaser repair decisions — preserve the complete code and vehicle details; check a current manufacturer source before drawing a conclusion.
- P0420 returning after converter and sensor work — preserve the complete code and vehicle details; check a current manufacturer source before drawing a conclusion.
- Mazda3: P0455 after a gas-cap change — preserve the complete code and vehicle details; check a current manufacturer source before drawing a conclusion.
- Subaru Outback: check-engine and EyeSight questions — preserve the complete code and vehicle details; check a current manufacturer source before drawing a conclusion.
- EcoBoost Mustang: P0012 and noise questions — preserve the complete code and vehicle details; check a current manufacturer source before drawing a conclusion.
How we use community accounts
- Treat the report as a question or symptom pattern, not an official diagnosis.
- Preserve the source link without copying personal identity into the site.
- Check manufacturer documents for the exact vehicle and current revision.
- Do not convert a single owner's outcome into a failure rate or product recommendation.
Sources and scope
- Reddit r/Subaru_Outback — EyeSight disabled and Check Engine Light discussion Document: date not recorded · Research checked: 2026-11-01
- Reddit r/MechanicAdvice — P0420 after catalytic converter replacement discussion Document: date not recorded · Research checked: 2026-11-01
Research snapshot: 2026-11-01. Source documents may have newer revisions. Verify current instructions and VIN eligibility with the manufacturer.