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Home › Mazda › 2002 › MPV ES › Repair and Diagnosis › Engine Performance › System › Engine Controls - Self-Diagnostics › Diagnostic Tests › DTC P0052: Left Front Ho2S Heater Circuit High › Possible Causes

Possible Causes

Faulty left front HO2S.
PCM malfunction.
Poor connection at left front HO2S or PCM harness connector terminals.
Short to power between left front HO2S and PCM.