LEMON Manuals
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Dodge and Ram
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2007
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Caliber SXT, 2.0 B
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Repair and Diagnosis
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Engine Performance
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System
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DTCS P0354 To P0507
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P0420-Catalyst 1/1 Efficiency
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Possible Causes
Possible Causes
Possible Causes
EXHAUST SYSTEM LEAK
ENGINE MECHANICAL CONDITION
AGING OR CONTAMINATED O2 SENSOR
O2 SENSOR WIRING AND CONNECTORS
CATALYTIC CONVERTER
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.