|
|
|
|
|
|
BMW Garage | BMW Meets | Register | Today's Posts | Search |
|
BMW 3-Series (E90 E92) Forum
>
Random 2E69 - Knock-Sensor Signal 2 code?
|
|
11-04-2019, 06:54 AM | #1 |
Brigadier General
2001
Rep 3,731
Posts |
Random 2E69 - Knock-Sensor Signal 2 code?
I was driving to work this morning....cruising down the road at around 50mph. All of a sudden the car goes into limp/no-boost mode and flashed the 1/2 engine icon. I stopped at a gas station and pulled the codes.....it's showing the 2E69 Knock-Sensor Signal 2 code. I reset it, and never had any other issues the rest of the way to work. I got on the gas hard a few times...no issues.
The car has fresh plugs and coils, and I just filled up with a fresh tank of 93 fuel (running MHD Stage2 91 tune). I've never had this code before....just a fluke? Bad gas? Other?
__________________
2007 335i, BMS DCI, BMS Chargepipe w/Tial BOV, ARM Catless Downpipes, silicone inlets, Bilstein B12 Prokit Suspension, Whiteline subframe bushings, Front/Rear M3 control arms, G-Plus FMIC, Stage 2 LPFP, Custom E40 tune by Justin (V8Bait), xHP stage 3 transmission flash, RB Two Turbos....10.90 @ 128mph
|
11-04-2019, 09:27 AM | #2 |
Brigadier General
2001
Rep 3,731
Posts |
From what I've found online.....the 2E69 code is showing that knock sensor itself is bad, and/or the wiring to it.
It's not detecting knock (as in bad fuel, or too much timing). Does that sound correct?
__________________
2007 335i, BMS DCI, BMS Chargepipe w/Tial BOV, ARM Catless Downpipes, silicone inlets, Bilstein B12 Prokit Suspension, Whiteline subframe bushings, Front/Rear M3 control arms, G-Plus FMIC, Stage 2 LPFP, Custom E40 tune by Justin (V8Bait), xHP stage 3 transmission flash, RB Two Turbos....10.90 @ 128mph
|
Appreciate
0
|
11-04-2019, 10:17 AM | #3 |
Major
540
Rep 1,040
Posts |
I had this code recently, turned out a mouse chewed through the knock sensor wiring. PITA to fix since you need to remove the intake manifold, but a quick solder & heat shrink remedied the issue.
Pic below. The bird seed and acorn shells on the side of the engine block are what brought me to the mouse conclusion, I'm basically Sherlock Holmes.
__________________
2011 E92 335is, Space Grey/Coral Red, 6MT.
RB 2+, Wedge tuned. E85 PI coming soon. Last edited by b92; 11-04-2019 at 10:24 AM.. |
Appreciate
0
|
11-04-2019, 10:25 AM | #5 |
Major
540
Rep 1,040
Posts |
Good time to do that! I was going to do the same but they didn't look bad, it had only been 18 months and less than 10k miles since I last cleaned them. Added the pic to my last post.
__________________
2011 E92 335is, Space Grey/Coral Red, 6MT.
RB 2+, Wedge tuned. E85 PI coming soon. |
Appreciate
0
|
11-04-2019, 11:09 AM | #6 |
Brigadier General
2001
Rep 3,731
Posts |
Would it be a good idea to reset the knock sensor Adaptations before I start thinking about replacing sensors and/or wiring? I think I can do that with MHD.
|
Appreciate
0
|
11-04-2019, 12:23 PM | #7 | |
Major
540
Rep 1,040
Posts |
Quote:
2E68 & 2E69 codes are caused by the ECM not getting a reading from the knock sensors, so either a knock sensor has gone bad or there's a wiring issue. I had purchased a new knock sensor before I took off the intake manifold and discovered the broken wire, so I just returned the knock sensor to FCPEuro for full price minus cost of return shipping (which was minimal since I'm one state over from them).
__________________
2011 E92 335is, Space Grey/Coral Red, 6MT.
RB 2+, Wedge tuned. E85 PI coming soon. |
|
Appreciate
0
|
11-04-2019, 04:53 PM | #8 |
Brigadier General
2001
Rep 3,731
Posts |
It must either be a bad connection, or faulty sensor (like everyone has said). I put about 100 miles on the car today, and never had the fault pop up again.
Very odd.....I hate intermittent issues like this. When the senors go bad....do they just die all together, or can they give funky/bad/no readings intermittently?
__________________
2007 335i, BMS DCI, BMS Chargepipe w/Tial BOV, ARM Catless Downpipes, silicone inlets, Bilstein B12 Prokit Suspension, Whiteline subframe bushings, Front/Rear M3 control arms, G-Plus FMIC, Stage 2 LPFP, Custom E40 tune by Justin (V8Bait), xHP stage 3 transmission flash, RB Two Turbos....10.90 @ 128mph
|
Appreciate
0
|
11-04-2019, 05:00 PM | #10 |
Brigadier General
2001
Rep 3,731
Posts |
Good to know, thanks!
__________________
2007 335i, BMS DCI, BMS Chargepipe w/Tial BOV, ARM Catless Downpipes, silicone inlets, Bilstein B12 Prokit Suspension, Whiteline subframe bushings, Front/Rear M3 control arms, G-Plus FMIC, Stage 2 LPFP, Custom E40 tune by Justin (V8Bait), xHP stage 3 transmission flash, RB Two Turbos....10.90 @ 128mph
|
Appreciate
0
|
11-06-2019, 08:45 AM | #12 | |
Major
540
Rep 1,040
Posts |
Quote:
__________________
2011 E92 335is, Space Grey/Coral Red, 6MT.
RB 2+, Wedge tuned. E85 PI coming soon. |
|
Appreciate
0
|
11-06-2019, 08:54 AM | #13 |
Brigadier General
2001
Rep 3,731
Posts |
So far it's been several days....and I haven't got the fault again....just that one time. Maybe it was just a fluke?? I will keep an eye on it ...if it does it again, it must be a wiring or sensor issue.
|
Appreciate
0
|
11-12-2019, 07:52 AM | #14 |
Second Lieutenant
87
Rep 236
Posts
Drives: e92 335iA
Join Date: Nov 2018
Location: Prague
|
I am having the same issue, it comes on after 70-200 km, once restarted it runs fine for no matter how long (even 500 km)... sometimes it stays off for months/couple of thousands of km and then it is back on... I will replace the sensor once I take the manifold off for cleaning...
__________________
"If everything seems under control, you're not going fast enough.” Mario Andretti
|
Appreciate
0
|
11-12-2019, 10:44 AM | #15 |
Registered
0
Rep 4
Posts |
Guys I’m having the same issue/issues and it’s driving me full blown mad. Keep getting 2e68 and 2e69 along with 3100 (limp mode). I’ve replaced knock sensors twice now, once out of a parts car and the second time direct from bmw dealership. Still pulling codes almost instantly after driving/cruising. Sometimes after I pull the code 2d2e for throttle valve angle- intake manifold vacuum. Are these related? I’ve tested the wiring and all seems to be correct and working. Brand new knock sensors from bmw must be good. What next??? The DME is a msd80 but appears in perfect working order. Help!!!
|
Appreciate
0
|
11-12-2019, 12:05 PM | #16 | |
Major
540
Rep 1,040
Posts |
Quote:
__________________
2011 E92 335is, Space Grey/Coral Red, 6MT.
RB 2+, Wedge tuned. E85 PI coming soon. |
|
Appreciate
0
|
11-12-2019, 12:28 PM | #17 | |
Registered
0
Rep 4
Posts |
Quote:
I tested from the sensors and harness all the way to the dme. All seemed correct and fine. Figured it would have been my sensors actually failing but after going brand new from bmw I don’t see the sensors being the issue. Is there anything else possible to check or something I’m missing? |
|
Appreciate
0
|
11-12-2019, 04:39 PM | #18 | |
Major
540
Rep 1,040
Posts |
Quote:
__________________
2011 E92 335is, Space Grey/Coral Red, 6MT.
RB 2+, Wedge tuned. E85 PI coming soon. |
|
Appreciate
0
|
11-12-2019, 05:02 PM | #19 |
Registered
0
Rep 4
Posts |
Most have pointed towards a new dme for troubleshooting afterwards, but my dme appears to be working completely fine. I’ll continue to do tests and diagnosis and post back here if I can find a fix. Any help greatly appreciated.
|
Appreciate
0
|
11-24-2019, 08:49 PM | #21 |
Lieutenant Colonel
1044
Rep 1,667
Posts |
It’s not a fluke...mine was behaving just like yours when it first started. It took over a year for it to transition from the first instance to almost every day.
|
Appreciate
0
|
11-27-2019, 03:41 AM | #22 |
Second Lieutenant
87
Rep 236
Posts
Drives: e92 335iA
Join Date: Nov 2018
Location: Prague
|
And what is the solution/cause? Mine have been quiet for over 2500 km :-)
__________________
"If everything seems under control, you're not going fast enough.” Mario Andretti
|
Appreciate
0
|
Bookmarks |
|
|