1ni34ne¶

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Reddit thread: 2016 Smart Fortwo 453 (0.9L turbo, 3cyl, Twinamic) constant misfiring¶

reddit.com/r/MechanicAdvice/comments/1ni34ne · p. 1 · Applies to: 453

Source: r/MechanicAdvice (score 1, 3 comments) Topic: misfiring, timing chain, camshaft sensor Models discussed: 453 Solution status: unclear

Problem: 2016 Smart Fortwo 453 experiencing constant misfiring on all 3 cylinders at idle and low speeds, with flashing check engine light. OBD codes indicate misfire on all cylinders plus camshaft/crankshaft errors.

Solution: unresolved; mechanic neighbor suspected timing chain failure or engine replacement needed, suggested trying camshaft sensor first as lower-cost diagnostic option, but no confirmed fix reported

Key facts: - Problem started intermittently at red lights, progressed to constant misfiring at idle after spark plug replacement - Spark plugs were replaced but issue returned worse the next day - OBD codes show misfire on all 3 cylinders plus camshaft/crankshaft timing errors - Mechanic suspected either failing camshaft sensor, timing chain wear, or engine replacement needed - Comment suggests 99% of random Smart 453 troubles are due to failing battery; recommend checking Evilution website for Smart-specific diagnostics