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#21
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I would clear the codes and replace the battery if it were me and see if anything returns.
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'01 740i Sport MKIV, Quad Brake Lights, Bi-Xenon retrofit, HID Fogs Dinan 7 Struts, Springs, camber plates, Intake, MAF, CAI, Throttle Body, NBT Retrofit, Strong Strut '99 318ti Titanium Silver; '97 318ti Boston Green; '13 X5 3.5i Saphire Black Metallic '84 633csi Black (sold); '88 325iC Black (sold); '97 740iL Black(sold); '01 740iS Black (sold);'97 318ti White (sold); '08 X5 4.8i Titanium Silver (sold); '96 318ti Alaska Blue (sold) |
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#22
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So there are three major components that fail in the SCR system commonly. The SCR catalyst, which can plug up because of soot or urea crystals, or the catalyst wears out. The SCR urea injector which plug from cystlized urea. Finally the DEF tank, which has a common temperature/heater module failure (which can be fixed by using the VW toureg module). The SCR's don't fail from low engine temperature (or at least not that I've seen). Low engine temp causes the glow plugs, glow plug module and often the DPF to fail. As when the engine fails to go over roughly 80C it keeps the glow plugs on which wears them out faster. Also with low engine temps the DPF will not do a normal regen and can plug up with soot. Causing a failed DPF and the infamous reduced power warning. The NOx sensors fail frequently on this car and can give the false indication that the SCR is not working. The typical test is to either replace both NOx sensors or swap sensors. There is also a sensor test that can be activated. I've had all of my emissions equipment replaced at least 1x, tuning and deleting has its downsides too like more noise, diesel stink, smoking (potentially), not resalable in emissions states, and its not cheap. |
#23
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Wouldn't the engine running that low cause a bunch of fuel to be burned and hydrocarbons into the exhaust? I didn't have ista set up when I went into limp mode unfortunately.
That is the right part right? Can someone also explain how to delete these codes individually? |
#24
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Battery seems to have been replaced last year. Bosch 49-850b. Looks like it has 120 amps. How do I made sure the proper coding was done?
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#25
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The DOC and DPF ensure that minimal residual fuel and soot are left in the exhaust by the time the exhaust stream reaches the SCR. The SCR doesn't have an issue with unburned fuel per say its bigger problem is having its passages clogged by soot, which is why its located post DPF. Also it can't handle sulphur either. BTW if the DOC wasn't working on your car you would have bad diesel stink exhaust fumes, like making your eyes water bad. So all of this was a long way to say, I don't know why your SCR failed, but low engine temps don't kill them as far as I've seen. They kill DPFs (don't get hot enough to regen), glow plugs and fuel economy (engine doesn't leave warm up mode). My car has had its SCR injector, Catalyst, and DEF tank all replaced at separate times and has not had the thermostat fail. SCR failures are not uncommon on BMW diesels. Last edited by Thecastle; 04-22-2017 at 11:44 AM. |
#26
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So I'm in the middle of doing injector 6, should I post a DYI with pictures? It was fairly straight forward. Biggest challenge was removing the injector. Once I broke down and bought a slide hammer it took about 5 seconds.
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#27
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Quote:
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From there, you can: -Reset injector adaptations. A must after replacing. -Register battery. -Delete codes from individual ECU(s) |
#28
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Did you have a download link for rgold? That one could pm me
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#29
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Is Rheingold that much better than INPA for the e70?
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2009 xDrive35D Comfort seats, Tech, Premium, Cold Weather, Sport w/ Adaptive Drive, Extended Nappa Leather Deleted & Stg 2+ Tune for over 115k miles 227k on the clock Being replaced by a 2016 X5d |
#30
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Don't have experience with INPA. Can't tell.
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