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P1124 & 1126 (both banks):
Fault condition:
Fuel/air mixture so lean that sensing has reached its rich threshold.
Potential fault areas:
– Intake air system leaking
-- Air is introduced past the MAF causing the mixture to be more lean
– Fuel pressure too low
-- Not enough fuel to meet demand causing the mixture to be more lean
– Volume supply of fuel pump too low
-- Not enough fuel to meet demand causing the mixture to be more lean
– Fuel injectors fouled
-- Not enough fuel to meet demand causing the mixture to be more lean
– Exhaust system leaking
-- When the exhaust system has leaks before the front O2 sensor will cause the O2 sensor to report a lean condition (excess oxygen i the exhaust)
-- Although the service info didn't mention the MAF as a potential fault area, I would test that also.
P0446:
Potential fault areas:
-- Purge air line blocked
-- Flow resistance of EVAP canister is too high
Note: fix other codes first before tackling this one.
Regards,
paul...
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