Falky100 Donating Members 305 Member For: 13y 7m 7d Gender: Male Posted 14/08/12 02:04 PM Share Posted 14/08/12 02:04 PM Hey Guys, Long story short. A while back when I had some o2 sensor issues. My former mechanic replaced my o2 sensors with non genuine ones, after he did this I still had issues and then he put a device in my exhaust that the o2 sensor piggybacked onto which is meant to slow/swirl the air and let the sensor read better (this is the sensor after the cat). Again I still had issues and after reading these forums it states that the Turbos only like genuine sensors. So I replaced the dump pipe sensor with a genuine one, and hey presto! my car seemed 100% fixed.However on the weeked I decided to take this rediculous pice out of my exhaust and see if it makes a difference to my power or anything. And just tonight I had the orange light of death come on (Engine light). So when I got home I plugged my elm in and found this..P0420, Catalyst system efficiency below threshold (bank 1)and the description read - Engine travelling at steady highway conditions for 5mins in closed loop, PCM detected Ho2s switch rate was too high.Now my first thought was, well obviously it needs the genuine sensor to read properly. But isnt bank 1 the dump pipe sensor?And last question. Is driving around with my car "below threshold efficiency" going to do any damage?So much for my long story short. But hey, I hope someone can shed some light on this for me..Cheers, John. Link to comment https://www.fordxr6turbo.com/forum/topic/81459-catalyst-system-efficiency-below-threshold-bank-1/ Share on other sites More sharing options...
Falky100 Donating Members 305 Member For: 13y 7m 7d Gender: Male Posted 14/08/12 02:06 PM Author Share Posted 14/08/12 02:06 PM Sorry. Forgot to add. My exhaust is stock standard. As is the rest of the car besides a mild custom tune. Link to comment https://www.fordxr6turbo.com/forum/topic/81459-catalyst-system-efficiency-below-threshold-bank-1/#findComment-1279489 Share on other sites More sharing options...
ms700 Moderating Team 10,170 Member For: 22y 4m 17d Gender: Male Location: Sydney Posted 14/08/12 03:03 PM Share Posted 14/08/12 03:03 PM However on the weeked I decided to take this rediculous pice out of my exhaust and see if it makes a difference to my power or anything.Feel free to correct me, but it would appear that this "rediculous pice" has indeed made a difference.How about you replace this "rediculous pice" back wherever it belongs, disconnect the battery for 10 mins, and see what happens. Link to comment https://www.fordxr6turbo.com/forum/topic/81459-catalyst-system-efficiency-below-threshold-bank-1/#findComment-1279494 Share on other sites More sharing options...
bionicxr6t05 Bronze Donating Members 2,216 Member For: 13y 10m 21d Gender: Male Posted 14/08/12 09:40 PM Share Posted 14/08/12 09:40 PM The p0420 code describes a condition where the downstream (after cat) and upstream (before cat) sensors have a common switching pattern, this is generally caused by a failing cat converter (hence catalyst efficiency below threshold) In obd codes Bank 1 and bank 2 are used to describe the left and right hand banks of a V engine, straight sixes have only one bank so they just say bank 1.I dont know what this rediculous piece is your talking about, can u post a pic or describe it better? Link to comment https://www.fordxr6turbo.com/forum/topic/81459-catalyst-system-efficiency-below-threshold-bank-1/#findComment-1279524 Share on other sites More sharing options...
Paulie2256 Donating Members 7,441 Member For: 16y 6m 27d Gender: Male Location: SE Melbourne Posted 14/08/12 09:51 PM Share Posted 14/08/12 09:51 PM (edited) You only replaced the dump sensor right? The code you see is referring to the after cat sensor. It has absolutely no impact on the car, it is only there for emissions to tell the cat isnt working properly. As long as the dump sensor is good then you will have no problem driving around with that code. Edited 14/08/12 09:52 PM by Paulie2256 Link to comment https://www.fordxr6turbo.com/forum/topic/81459-catalyst-system-efficiency-below-threshold-bank-1/#findComment-1279528 Share on other sites More sharing options...
1600dave Donating Members 872 Member For: 14y 5m 8d Posted 15/08/12 02:25 AM Share Posted 15/08/12 02:25 AM something like these?http://www.ebay.com.au/itm/O2-Extender-Oxygen-M18-Spacer-HHO-Wideband-Dry-Cell-Sensor-02-Test-Pipe-Bung-H20-/130716275163?pt=Race_Car_Parts&hash=item1e6f4c11dbhttp://www.ebay.com.au/itm/oxygen-sensor-o2-02-header-bung-pipe-spacer-18mm-thread-M18-x-1-5-90-degrees-HHO-/130726837064?pt=Race_Car_Parts&hash=item1e6fed3b48 Link to comment https://www.fordxr6turbo.com/forum/topic/81459-catalyst-system-efficiency-below-threshold-bank-1/#findComment-1279595 Share on other sites More sharing options...
Wenier Donating Members 1,736 Member For: 15y 5m Gender: Male Location: Christchurch, New Zealand Posted 15/08/12 02:58 AM Share Posted 15/08/12 02:58 AM So all it does is move the sensor out of the exhaust flow, would've thought that would give incorrect feedback. Link to comment https://www.fordxr6turbo.com/forum/topic/81459-catalyst-system-efficiency-below-threshold-bank-1/#findComment-1279604 Share on other sites More sharing options...
bjc Donating Members 2,823 Member For: 21y 9m 14d Gender: Male Location: Townsville Posted 15/08/12 03:08 AM Share Posted 15/08/12 03:08 AM My f6x lives with this code as there is no cat on the car... 1 Link to comment https://www.fordxr6turbo.com/forum/topic/81459-catalyst-system-efficiency-below-threshold-bank-1/#findComment-1279606 Share on other sites More sharing options...
Falky100 Donating Members 305 Member For: 13y 7m 7d Gender: Male Posted 15/08/12 04:51 AM Author Share Posted 15/08/12 04:51 AM Dave is pretty much on the money with that link. Except mine is straight, not 90 degrees. Yes I only replaced the dump sensor. There is still a non genuine sensor post cat. It is the same sensor in one of my other threads (there is a pic of it in there). And it is quite different to the genuine ones. Would you think buying a genuine sensor could fix this problem? If so, does anyone have a part # handy?Cheers and thanks for all the feedbackJohn. Link to comment https://www.fordxr6turbo.com/forum/topic/81459-catalyst-system-efficiency-below-threshold-bank-1/#findComment-1279630 Share on other sites More sharing options...
1600dave Donating Members 872 Member For: 14y 5m 8d Posted 15/08/12 05:03 AM Share Posted 15/08/12 05:03 AM Not sure if it'll help or not, but get these instead of genuine Ford if you do decide to change it.NTK make them for Ford, these just don't have the Ford stamp, and are heaps cheaper.http://www.ngk.com.au/oxygen-sensors-part-finder?PageMode=Results&Make=FORD&Model=Falcon+BF++XR-6T&Capacity=4.0L&Year=10%2F05+-+02%2F08&Engine=&Engine=Barra+240T%2C+6FPAAAJG6+Cyl+DOHC+TMPFI+24V+240+http://www.carpartsaustralia.com.au/product_info.php?products_id=11652http://www.carpartsaustralia.com.au/product_info.php?products_id=11651 Link to comment https://www.fordxr6turbo.com/forum/topic/81459-catalyst-system-efficiency-below-threshold-bank-1/#findComment-1279637 Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now