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Joined: February 3, 2004
Posts: 14,160
Likes: 73
Merged your threads . .
Might also want to check your O2 sensor.
A quick search on google.com found the following (among a number of other threads.)
Might also want to check your O2 sensor.
A quick search on google.com found the following (among a number of other threads.)
System Efficiency Below Threshold (Bank 2)
Top Indicates Bank 2 catalyst system efficiency is below the acceptable threshold.
Use of leaded fuel
Damaged HO2S
Malfunctioning ECT
High fuel pressure
Damaged exhaust manifold
Damaged catalytic converter
Oil contamination
Cylinder misfiring
Downstream HO2S wires improperly connected
Damaged exhaust system pipe
Damaged muffler/tailpipe assembly
Retarded spark timing
Compare HO2S upstream and downstream switch rate and amplitude. Under normal closed loop fuel conditions, high efficiency catalysts have oxygen storage which makes the switching frequency of the downstream HO2S very slow and reduces the amplitude of those switches as compared to the upstream HO2S. As catalyst efficiency deteriorates, its ability to store oxygen declines and the downstream HO2S signal begins to switch more rapidly with increase amplitude, approaching the switching rate and amplitude of the upstream HO2S. Once beyond an acceptable limit the DTC is set
Top Indicates Bank 2 catalyst system efficiency is below the acceptable threshold.
Use of leaded fuel
Damaged HO2S
Malfunctioning ECT
High fuel pressure
Damaged exhaust manifold
Damaged catalytic converter
Oil contamination
Cylinder misfiring
Downstream HO2S wires improperly connected
Damaged exhaust system pipe
Damaged muffler/tailpipe assembly
Retarded spark timing
Compare HO2S upstream and downstream switch rate and amplitude. Under normal closed loop fuel conditions, high efficiency catalysts have oxygen storage which makes the switching frequency of the downstream HO2S very slow and reduces the amplitude of those switches as compared to the upstream HO2S. As catalyst efficiency deteriorates, its ability to store oxygen declines and the downstream HO2S signal begins to switch more rapidly with increase amplitude, approaching the switching rate and amplitude of the upstream HO2S. Once beyond an acceptable limit the DTC is set
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Joined: August 12, 2011
Posts: 8
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Originally Posted by Evil_Capri
Merged your threads . .
Might also want to check your O2 sensor.
A quick search on google.com found the following (among a number of other threads.)
Might also want to check your O2 sensor.
A quick search on google.com found the following (among a number of other threads.)
GT Member
Joined: January 12, 2011
Posts: 150
Likes: 1
Ford v6s all have a problem with cats. I have replaced so many of these things its unreal. Before you spend that money though you need to check for intake leaks. Do you have a lean code at all? If so most likely intake leak. If intake is sealed then you nees to put a vacuum gauge and read vacuum or use a temp gun and see the heat of the cat to determine if its bad
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2005-2009 Mustang
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Oct 5, 2015 09:43 AM