Ways to solve SES/CEL caused by catless DP discuss.

J.Gats_M4 · 04-13-2012, 10:43 PM

First of all sorry if this has already been covered and sorry for sounding like noob but here's my scenario:

I had catless dps installed and then triggered my ses light the next day. A couple of days later I installed the bms downpipe fix v3. I had it set at the 5 oclock position btw. My ses light stays on and then it goes away after around 60 miles or so. The next day after around a 40 mile or so drive it comes back on and has been on ever since.

What would you guys recommend for me to do in order to remove my ses light?

I don't have a tune and I also don't have an obd scanner nor can I afford either of the 2 at the time being.

Thanks in advance.

Chrisred · 04-14-2012, 02:12 AM

Have similar prob. Have the BMS do fix installed now for 1.5 years about and all of a sudden the cel light is always on. Code says lambda probe on front of cat 2....any ideas??

fozzydj · 02-06-2018, 04:53 PM

Ive read that MHD prevents any CEL after installing DPs. Would this also prevent any CELs if the secondary cats were removed also?

Does anyone have any thoughts on removing those? My interests are getting a good burble, exhaust note. Is it worth me taking the secondarys off as well?

Haynpunch · 02-07-2018, 09:47 AM

Quote:

Originally Posted by fozzydj

Ive read that MHD prevents any CEL after installing DPs. Would this also prevent any CELs if the secondary cats were removed also?

Does anyone have any thoughts on removing those? My interests are getting a good burble, exhaust note. Is it worth me taking the secondarys off as well?

Secondary cats have no monitoring and will not cause CEL if removed

fozzydj · 02-09-2018, 04:47 PM

Quote:

Originally Posted by Haynpunch

Secondary cats have no monitoring and will not cause CEL if removed

Thank you

johnscales · 09-21-2019, 07:27 PM

Another thread resurrection.

Have just started to get error : 2C7B (After cat o2 Sensor signal, Bank 1)
Have also been running catless for 3 years and not had the error until now.
No symptoms observed affecting drivability or difference in vehicle performance.
Couple of q's
1) Since these are the post cat (which I obviously don't have) sensors do I really need to replace them?
2) I'm self tuning the past couple of months and wondering if my logs will be impacted. I haven't seen anything odd in my lambda readings yet.

Thanks.

04-13-2012, 10:43 PM	#45
J.Gats_M4 Private First Class 24 Rep 154 Posts Drives: 18 F82 M4 ZCP 6MT Join Date: Jun 2011 Location: Orange County, California iTrader: (1)	First of all sorry if this has already been covered and sorry for sounding like noob but here's my scenario: I had catless dps installed and then triggered my ses light the next day. A couple of days later I installed the bms downpipe fix v3. I had it set at the 5 oclock position btw. My ses light stays on and then it goes away after around 60 miles or so. The next day after around a 40 mile or so drive it comes back on and has been on ever since. What would you guys recommend for me to do in order to remove my ses light? I don't have a tune and I also don't have an obd scanner nor can I afford either of the 2 at the time being. Thanks in advance.
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04-14-2012, 02:12 AM	#46
Chrisred Captain 81 Rep 788 Posts Drives: BMW 335xi coupe Join Date: Jan 2010 Location: Montreal, Canada iTrader: (0)	Have similar prob. Have the BMS do fix installed now for 1.5 years about and all of a sudden the cel light is always on. Code says lambda probe on front of cat 2....any ideas?? __________________ JB4 Trebila tuned cp-e IC AMS exhaust BMS DCI AR DP's METH RB TURBO 19" VMR VB3 Stoptech BBK TC KLINE VORSHLAG SPEC STG 3 OSS design
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02-06-2018, 04:53 PM	#47
fozzydj DIYer, 335i N54 lover 72 Rep 173 Posts Drives: N54 BMW 355i SE 2007, 148,000 Join Date: Jun 2015 Location: Leeds, England, UK iTrader: (0)	Ive read that MHD prevents any CEL after installing DPs. Would this also prevent any CELs if the secondary cats were removed also? Does anyone have any thoughts on removing those? My interests are getting a good burble, exhaust note. Is it worth me taking the secondarys off as well?
	Appreciate 0 Quote

09-21-2019, 07:27 PM	#50
johnscales Private First Class 27 Rep 118 Posts Drives: 335i MSport Join Date: May 2013 Location: UK iTrader: (0)	Another thread resurrection. Have just started to get error : 2C7B (After cat o2 Sensor signal, Bank 1) Have also been running catless for 3 years and not had the error until now. No symptoms observed affecting drivability or difference in vehicle performance. Couple of q's 1) Since these are the post cat (which I obviously don't have) sensors do I really need to replace them? 2) I'm self tuning the past couple of months and wondering if my logs will be impacted. I haven't seen anything odd in my lambda readings yet. Thanks.
	Appreciate 0 Quote