smartcarofamerica.com/threads/slow-down.162541

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Forum thread: Slow down | Smart Car of America Forum

smartcarofamerica.com/threads/slow-down.162541 · p. 1 · Applies to: 450

Source: smartcarofamerica.com Topic: limp mode, glow plugs, diesel performance Models discussed: 450 Solution status: unclear

Problem: 2010 Smart ForTwo diesel experiencing limp mode (slowing down at speed) after glow plug replacement; glow plug warning light disappeared but performance issue persists.

Solution: The reply suggests using an OBD-II diagnostic scanner to read fault codes from the engine management system. The respondent (colin25) shares their experience with a 2009 diesel model that entered limp mode due to a clogged air intake/air filter, which was difficult to access and rarely maintained by owners. They recommend checking for fault codes first to identify the root cause, as limp mode can be triggered by various issues including air filter blockage, DPF problems, or other sensor faults.

Key facts: - 2010 Smart ForTwo CDI diesel experiencing limp mode after glow plug replacement - Glow plug warning light cleared but performance issue persists - OBD-II diagnostic scan recommended to identify root cause - Previous case resolved by replacing air filter (difficult access location on CDI models) - DPF filter systems prone to limp mode issues on later diesel models