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Exhaust leak Catalyst efficiency decrease Low exhaust temperature Injector flow partially blocked
P0137 Right-hand catalyst monitor sensor sensing circuit low voltage
Catalyst monitor sensor disconnected Catalyst monitor sensor to ECM wiring open circuit Catalyst monitor sensor short circuit to ground Catalyst monitor sensor failure
For catalyst monitor sensor tests, GO to Pinpoint Test G258127p8.
P0138 Right-hand catalyst monitor sensor sensing circuit high voltage
Catalyst monitor sensor sensing circuit short Catalyst monitor sensor ground braided shield Catalyst monitor sensor failure
For catalyst monitor sensor tests, GO to Pinpoint Test G258127p8.
P0140 Right-hand catalyst monitor sensor sensing circuit no activity
Catalyst monitor sensor disconnected Catalyst monitor sensor mechanical damage Catalyst monitor sensor to ECM wiring open circuit Catalyst monitor sensor sensing circuit short Catalyst monitor sensor RH short circuit to ground Catalyst monitor sensor ground braided shield Inspect the HO2S for connection/damage. For HO2S sensor diagnosis, GO to Pinpoint Test G258127p8. Check for exhaust leak, for further information, Exhaust temperature will be low if misfire/poor fuel supply condition exists. Catalytic converter efficiency will be poor until it reaches "light-off".
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