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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 04-19-2012, 03:44 PM   #221
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I redid the installation checked everything and the CEL won't go away. Same two codes. :/

I have till the end of the month to find out what's up. Inspections right around the corner.

F1004fun

I had a bad fuel pump when I installed the LC-1. The two codes I have now went away at the time and for the time being. I replaced the pump and cars like new. I had the P0171 and P0174 codes. Those went away. Then the P0420 and P0430 codes came up on the day before I was going to go get her inspected.

Both times the light came on the highway.
Have you cleared adaptations?
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Old 04-19-2012, 03:53 PM   #222
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I just did some googling and it seems the cat effeciancy codes work by comparing some precat sensor readings with the post values. Age of the pre can throw the balance between them out. So if the lc1 is functioning properly, it still may be the pre.
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Old 04-19-2012, 06:08 PM   #223
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I just did some googling and it seems the cat effeciancy codes work by comparing some precat sensor readings with the post values. Age of the pre can throw the balance between them out. So if the lc1 is functioning properly, it still may be the pre.
But shouldn't I have precat codes then if they are bad?
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Old 04-19-2012, 06:59 PM   #224
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Have you cleared adaptations?
Just erased the codes that's it.
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Old 04-19-2012, 07:03 PM   #225
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But shouldn't I have precat codes then if they were bad?

Guys I swapped both precat o2's with eachother and she started idling and misfiring like crazy! I swapped the o2's back and the car is fine.

If one of my o2's is new why am I getting these codes on both banks? It is not possible that my new o2 is bad already.

Is it possible that one precat o2 can effect both banks?
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Old 04-19-2012, 07:29 PM   #226
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Try resetting the adaptations if you can
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Old 04-19-2012, 11:49 PM   #227
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Let's take a second and analyze this data we have. As it was said by HiHoBrian, the cat monitors look at the rear O2 sensor data and compare it too the front. As I said earlier a lazy front O2 sensor will cause cat efficiency codes.
Now I asked you about fuel trims, this is why it is important. You switched your O2 sensors and your car ran like crap because it had all ready adapted to what ever lazy O2 sensor was in it's respective bank. Our DME's will actually trim fuel to each bank of three cylinders.
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Old 04-20-2012, 08:49 AM   #228
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Let's take a second and analyze this data we have. As it was said by HiHoBrian, the cat monitors look at the rear O2 sensor data and compare it too the front. As I said earlier a lazy front O2 sensor will cause cat efficiency codes.
Now I asked you about fuel trims, this is why it is important. You switched your O2 sensors and your car ran like crap because it had all ready adapted to what ever lazy O2 sensor was in it's respective bank. Our DME's will actually trim fuel to each bank of three cylinders.
So do you suggest that I replace both precat o2 sensors?
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Old 04-20-2012, 09:02 AM   #229
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If you reset adaptations, that may "calibrate" (for lack of a better term) a "lazy" o2 sensor. You really should look into setting up INPA/ediabas - that will enable you to see fuel trims, clear/reset codes, and reset adaptations - all things people are suggesting.
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Old 04-20-2012, 09:33 AM   #230
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If you reset adaptations, that may "calibrate" (for lack of a better term) a "lazy" o2 sensor. You really should look into setting up INPA/ediabas - that will enable you to see fuel trims, clear/reset codes, and reset adaptations - all things people are suggesting.
I already ordered new o2's. I'll have a shop clear everything including adaptations and what not.
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Old 04-21-2012, 08:07 AM   #231
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Yes, thats pretty much it, but you should tie all those grounds in with a ground wire that goes to the main ground lug behind to e-box, this will keep all the signals clean and properly referenced with the DME.
Can you or someone happen to update this diagram if this is the correct diagram?
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Old 04-21-2012, 09:38 PM   #232
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Guys my CEL went away when I started her leaving the mall. I hooked it up with my scanner and the codes are still there. What's going on? Damn car is playing games with me.
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Old 04-21-2012, 09:40 PM   #233
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Guys my CEL went away when I started her leaving the mall. I hooked it up with my scanner and the codes are still there. What's going on? Damn car is playing games with me.
Readiness codes
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Old 04-21-2012, 10:03 PM   #234
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Readiness codes
So it looks like I need to drive more and see what happens
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Old 04-21-2012, 10:06 PM   #235
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So it looks like I need to drive more and see what happens.
Yea, a few drive cycles and around 40-50 miles
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Old 04-21-2012, 10:07 PM   #236
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Ok. Looks like the adaptations are balancing out.
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Old 04-24-2012, 12:38 PM   #237
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Guys no CEL but those two codes are still showing up in my pocket scanner..... I've driven more than 50 miles with it off already.
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Old 04-26-2012, 08:39 PM   #238
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For everyone who removed their stock post O2 sensors, why are you wiring up 2 resistors? Can't you just run both of the post o2 heater wires to the same resistor?
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Old 04-26-2012, 08:44 PM   #239
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For everyone who removed their stock post O2 sensors, why are you wiring up 2 resistors? Can't you just run both of the post o2 heater wires to the same resistor?
Well, you would probably run into series/parallel wiring and reducing or increasing the ohms of the resistor.
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Old 04-27-2012, 01:33 PM   #240
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Ok its been 200+ miles since my CEL went away on the dash. I plug in my pocket scanner and the codes are still there. Do I need to clear my codes so they go away for good? I have inspection next week.

I had a similar issue when I had my fuel pump issue. Had 3 codes. When I replaced the pump.... 20 miles later the CEL went away but the codes were still there. I cleared the codes and to this day the codes are gone.
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