Hey folks,
2013 Mustang GT here. I've been fighting passing emissions for the last year or so. I'm in Arizona, so emissions regulations are relaxed here, but only 1 system in the monitor readiness check is allowed to be "not ready" by Arizona law. My car has an issue getting O2 sensor and O2 heater sensor monitors (2 seperate monitors) to ready up. The catalyst monitor does ready up eventually although it takes about 5-10 drive cycles after resetting the readiness monitors every time. Here's what I've concluded:
I have Kooks longtube headers, Kooks catted H-pipe midpipe, and a Lund tune. With no O2 spacers / defouler trick on the O2 sensors, the car pulls a CEL for too much emissions from the high flow cats (I believe P0420 and P0430) BUT both the O2 sensor and O2 heater sensor monitors read as "ready". With O2 spacers / defouler trick on O2 sensors, no CELs appear but the O2 sensor and O2 heater sensor monitors stay in the "not ready" position. I imagine this is due to them not getting hot enough being that the O2 sensors are too far away from the midpipe to get hot enough from exhaust. This also tells me the issue is not tune related as both monitors read "ready" when there are no O2 spacers installed.
I'm at a dead end here not knowing what to do. I'm not able to install the stock exhaust as I do not have it and a stock midpipe does not fit on Kooks LTHs. I could purchase Kooks Green catted midpipe (has extra restrictive cats) but I would really rather not spend $2500 on an exhaust pipe just to pass emissions. I would ideally like to find a fix for this issue that works, including not triggering a CEL and having all monitors as ready. Does anyone have any ideas for me? Open to anything.
Thanks everyone!
2013 Mustang GT here. I've been fighting passing emissions for the last year or so. I'm in Arizona, so emissions regulations are relaxed here, but only 1 system in the monitor readiness check is allowed to be "not ready" by Arizona law. My car has an issue getting O2 sensor and O2 heater sensor monitors (2 seperate monitors) to ready up. The catalyst monitor does ready up eventually although it takes about 5-10 drive cycles after resetting the readiness monitors every time. Here's what I've concluded:
I have Kooks longtube headers, Kooks catted H-pipe midpipe, and a Lund tune. With no O2 spacers / defouler trick on the O2 sensors, the car pulls a CEL for too much emissions from the high flow cats (I believe P0420 and P0430) BUT both the O2 sensor and O2 heater sensor monitors read as "ready". With O2 spacers / defouler trick on O2 sensors, no CELs appear but the O2 sensor and O2 heater sensor monitors stay in the "not ready" position. I imagine this is due to them not getting hot enough being that the O2 sensors are too far away from the midpipe to get hot enough from exhaust. This also tells me the issue is not tune related as both monitors read "ready" when there are no O2 spacers installed.
I'm at a dead end here not knowing what to do. I'm not able to install the stock exhaust as I do not have it and a stock midpipe does not fit on Kooks LTHs. I could purchase Kooks Green catted midpipe (has extra restrictive cats) but I would really rather not spend $2500 on an exhaust pipe just to pass emissions. I would ideally like to find a fix for this issue that works, including not triggering a CEL and having all monitors as ready. Does anyone have any ideas for me? Open to anything.
Thanks everyone!