help with s-10

[bird of fire]

I changed the cat on my s-10 two months ago and the DTC P0420 Catalyst System Low Efficiency went a away. It just came back any ideas?

[whitdog54]

Re: help with s-10

bad cat? Guy on another forum bought a new high flow cat and had to replace it after 3 months....some times you just get screwed. Check the 02 sensor

[97rs4life]

Re: help with s-10

did you get a universal high flow one? If so did you use a o2 sim or does the s10 not have a post-cat o2?

[bird of fire]

Re: help with s-10

it a oe cat and it does have a post cat o2 sensor. You guies think the sensors bad

[bird of fire]

Re: help with s-10

I changed the rear o2 sensor and Iam still getting the code any ideas? help

[bird of fire]

Re: help with s-10

any one?