LEMON Manuals
: Even more car manuals for everyone: 1960-2025
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Mazda
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2003
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MPV ES
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Repair and Diagnosis
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Engine Performance
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System
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Engine Controls - Self-Diagnostics
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Diagnostic Tests
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DTC P0138 Or DTC P0158
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Possible Causes
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Possible Causes
Rear HO2S malfunction.
Short to power circuit in wiring between rear HO2Ss and PCM harness connectors.