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Hi guys, I just failed my emmissions testing and I only just put on a new cat converter last week. They diagnosed fault code P0172- System too rich (bank1) anyone know what may cause this.
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Your engine running rich could be a number of things. After battling my T-5R for the last few week, I would advise looking for any possible vacuum leaks. You will also want to check the fuel pressure, as if it was too high, it'll cause a rich condition. And finally, check your injectors for leakage. Hope this helps!
 
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