07-04-2020, 10:30 AM | #1 |
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2012 X5 diesel reduced power with lots of codes
Hello, happy 4th!
A couple days ago the 2012 x5 diesel got the first reduced power msg with roughly 130k miles on the clock. Lots of codes, 13 to be accurate: 46F9 4507 4BDC 4862 48DC 4B82 4C83 4370 44DD 3F25 3FF0 4865 4530 I checked on carbon build up, see image. There is some... i have no reference if it a lot of not. How do I start diagnosing the issue? any leads? Cheers! H. |
07-04-2020, 12:04 PM | #2 |
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You can start by writing out the descriptions for each code...
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07-04-2020, 03:07 PM | #3 |
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ok. here is what i found...
Seems to be related to the EGR. With all these codes, how do I go about testing? What is a good place to start? At first I thought it may be vacuum related. When I turn on the car I can see the valve at the EGR cooler and turbo control move. Would that point to the vacuum system being intact? 46F9: reducing agent active tank temp sensor open 4507: Exhaust-gas recirculation, control deviation 4BDC: DDE: Fuel presupply-pressure control 4862: Air system, air to EGR mass flow, plausibility 48DC: Boost pressure sensor, plausibility 4B82: Exhaust-gas recirculation-rate control, control deviation 4C83: Exhaust backpressure before exhaust turbocharger, plausibility 4370: Exhaust gas return-rate control, control deviation 44DD: Exhaust gas return-rate control, control deviation 3F25: Charge air hose monitoring 3FF0: Air mass measurement 4865: Air system, air to EGR mass flow, plausibility 4530: Charging pressure control, control deviation: Charging pressure too low/positive control deviation |
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07-04-2020, 05:10 PM | #4 |
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You have a leak in the egr system. It’s either one of the dpf Pressure sensor lines burned through, a cracked egr cooler or a plugged egr valve. Less often it’s a bad maf and pressure sensors.
You also have a bad scr tank. The heater can be replaced by a toureg scr tank heater for a big cost savings. |
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07-04-2020, 06:04 PM | #5 |
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Thecastle, thank you very much! Would you be able to point which one is actually leading to the reduced engine power problem? I am looking to get this done first.
I looked at the erg cooler and cannot see any leaks, no fluid and no sote around it either. Are there other signs I should watch for? |
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07-06-2020, 06:04 PM | #6 |
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Isn't the SCRA tank covered under extended warranty? You are just outside the 120k mile but within 10 years. Maybe a dealership will go out on a limb for you (goodwill).
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07-12-2020, 07:52 AM | #8 |
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Thank you for all the responses! Last week I ordered a set of vacuum hoses to be prepared, those arrived yesterday. This morning I went and checked the exhaust gas pressure line which seems to look ok... at least to me. When I started the car I was surprised to not see a warning on the dash. After driving it a bit it showed up when I went up a hill and went into reduced power mode. Is this fault always intermittent?
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07-12-2020, 03:28 PM | #9 |
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The EMP hose may look fine but I'd remove it and see if it's clogged
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08-15-2020, 03:10 PM | #10 |
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Got it figured out... was the map sensor. Replaced in less than 30 minutes and limp mode gone, however, still the following codes left:
1) 4BDC 2) 46F9 The last one is obvious. How about the first... could a clogged fuel filter trigger it? |
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