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Discussion Starter · #1 ·
So here is the deal. My 2013 focus st is coming up on emissions. I have driven 900 miles (tuned) without the o2 and heater getting ready and 948 miles without a tune(Stock tune) with the same exact issue. I have followed all techniques to get it ready, except the damn o2 and heater doesnt seem to want to get ready. Any advise would help. The car only has 36k on it. I drove this weekend 6 and a half hours at 55 mph on the highway (wanted to pull my hair out) I also did the from a stop accelerate to 65, hold it for 5 secs, throttle off until 40 mph and back up to 65 for 5 secs for 5 times. Not a damn thing got ready. Please help lol
 

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do you have an aftermarket downpipe?

Perhaps the tuner turned the secodary 02 sensor off for the tune so you wont get a check engine light. If 02 is getting ready and u dont have a downpipe then the 02 might be shot.

If you do have a down pipe you will need a defouler.

just re-read and said u tried with stock tune. Probably shot 02 or need a defouler.

What are your mods?
 
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