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BMW · Audi · Mercedes-Benz

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Ranked causes, real test steps, parts, tools, cost and difficulty — written like a master tech writes a work order, with “verify this” instead of an invented torque spec.

Fault diagnosisAnswer a few targeted questions and get a ranked cause list with the test that confirms each one.Try it →Build plannerVehicle, budget, power goal in — a staged parts list with supporting mods and costs out.Try it →Parts compatibilityFitment answers with the adapters, offsets and coding the swap actually needs.Try it →Maintenance plannerMileage-aware service checklist plus the known failure points for your engine.Try it →

OBD2 ScannerRead and clear fault codes with an ELM327 adapter, watch live sensor data, or decode any P-code and BMW hex code.Scan my car →

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Repairs & guides

Walnut blasting intake valves

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Starter replacement without dropping the intake

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Charge pipe failure and boost leak testing

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Rod bearing service interval reality check

Guide · 8h · Difficulty 5/5

P0012 VANOS: solenoid, oil or timing?

Diagnosis · 2h · Difficulty 3/5

Stage 1 vs Stage 2: what actually changes

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