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Discussion Starter · #1 ·
Hey,

I just bought a 2014 focus st from a local ford dealer. The PO installed a roush catback and cai. I drove it about 200 miles after I bought the car and now its throwing two codes. P0171 and P0420. I am thinking the down o2 is bad, exhaust leak or vacuum leak. I went to the dealer twice about the issue and they won't even look at it for me. They said it needs to be tuned because of the aftermarket parts. I have a 3 month dealer warranty. I'm not sure if I should spend $500 on a Cobb tuner or have an actual tuner shop tune the car and get rid of the cel's. It's been freezing here in Michigan so I haven't had much time to look for any leaks. Need some advice from everyone.
 
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