P0126 — OBD-II trouble code

A generic powertrain OBD-II trouble code. Below are the vehicles and failure patterns where owners report it, drawn from NHTSA complaints.

In ProblemsByVin's analysis of the NHTSA owner-complaint record, owners cite P0126 across 5 vehicle failure patterns. Diagnostic codes in complaints are reported by owners and are unverified — they point to where this code shows up, not a confirmed diagnosis. Open a page below for the full pattern (symptoms, mileage, repair costs owners cite).

Vehicles where owners report P0126 5 patterns

2021 Mazda CX-5

engine — Excessive oil consumption / oil burning

2020 Mazda CX-5

engine — Coolant thermostat failure

2019 Mazda CX-5

engine — Cracked Cylinder Head with Oil Leak

2019 Mazda CX-5

powertrain — Cracked Cylinder Head

2014 Hyundai Santa Fe

powertrain — Engine oil starvation and seizure

Codes are pulled from what owners wrote in their NHTSA filings — they're allegations, not a shop diagnosis. Always confirm with a live scan. Browse all diagnostic codes →