07 slow to accelerate when warm

[Jdm5630]

My expy seems to be accelerating slowly from a stop light or if im entering a highway. It only does it when the engine is warm. Its been throwing a p0420 code for a couple months. Could that have something to do with it? Ive changed plugs and coil packs 2 years ago and ive replaced the fuel filter 3 months ago. Any suggestions?

 

[ezeq]

Might be the O2 sensor.

 

[Jdm5630]

Is there any way to check if you have a bad 02 sensor?

 

[Bedrck47]

P0420 - Catalyst System Efficiency Below Threshold (Bank 1)
Description: Indicates the bank 1 catalyst system efficiency is below the acceptable threshold.
Possible Causes: Use of leaded fuel
Damaged heated oxygen sensor (HO2S)
Out of range engine coolant temperature (ECT) sensor
High fuel pressure
Damaged exhaust manifold
Damaged catalytic converter
Oil contamination
Cylinder misfiring
Downstream HO2S wires incorrectly connected
Damaged exhaust system pipe
Damaged muffler/tailpipe assembly
Retarded spark timing
Leaking fuel injector

Diagnostic Aids: Compare HO2S upstream HO2S11 and downstream HO2S12 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 increased amplitude, approaching the switching rate and amplitude of the upstream HO2S. Once beyond an acceptable limit the DTC is set.

 

[nauti1]

I just spent $1600 on new plugs and coils (three of them broke) and right side cat w/ o2 sensor. Runs great now. Same symptoms as you describe.


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