LEMON Manuals
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Mazda
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2003
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MX-5 Miata LS, Automatic
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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 P0171: Fuel Trim System Too Lean
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Possible Causes
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Possible Causes
Exhaust system leak.
Fuel filter clogged or restricted.
Front HO2S malfunction.
Front HO2S heater malfunction.
Fuel lines or fuel pump leaking.
Fuel pressure regulator malfunction.
Fuel pump malfunction.
Low compression.
Misfire.