P0420 was on, cats were replaced with Bosal California approved cats as well as new Denso sensors. Readiness set, no codes for several thousand miles.
Code has returned, no other codes.
Things I have tried:
Fuel pressure does not drop when vehicle turned off
Replaced leaking intake tube
Replaced broken upper resonator box
Replaced exhaust resonator and muffler (due to leaks)
Replaced EGR intake gasket (smoke was leaking out while smoke testing)
LTFT remains above 15%, although before the above items found leaking during smoke test, it was above 18%
I am unable to find anything else leaking during smoke test. I do not know where to go next.
have the same problem?
Wednesday, March 22nd, 2017 AT 1:01 PM