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X5 E70 (2007 - 2013)
E70 BMW X5 produced between 2007 and 2013. Discuss the E70 X5 with other BMW owners here.

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  #1  
Old 02-19-2019, 11:44 AM
m5e28s38 m5e28s38 is offline
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P203a = Bad SCR Reservoir

My 2012 X5 35d at about 86,000 miles through a check engine light. Code reader showed P203a. Reset a couple of times just for the same code to come back in a few days.

Took it to the dealer, who diagnosed as bad SCR tank. I don't know which tank (active or reserve). Dealer said that it will be covered under warranty. I did not argue.

Let me know if anyone is interested in more details.

Thanks.

Sasha.
El Sobrante, CA

'88 M5
'12 X5 35d
'18 Mini Cooper
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  #2  
Old 02-19-2019, 12:38 PM
ard ard is offline
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Nope. Common issue...BMW has seen SO SO many, they were forced to offer an extended warranty on the part

Glad you are under the 120k /10yr (I think?) limits.

Be careful they dont hit you up with a few thou$and in "oh, you have better fix ABC or your gonna die" stuff....
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  #3  
Old 02-19-2019, 12:46 PM
m5e28s38 m5e28s38 is offline
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Thank you Ard,

Funny you should mention dealer asking for extra repairs: they found oil leak from one of the turbo oil lines.

I do have an extended warranty with no-bmw insurer. The dealer will check with them, if they don't cover, I will probably not going to fix oil leak for now.
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  #4  
Old 02-19-2019, 01:15 PM
n1das n1das is offline
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Sounds like another case of the passive tank being filled from a bulk DEF dispenser and forcing DEF through the air stone vents from the "water hammer" effect when the tank reaches full. The DEF crystallizes and clogs the air stone vents. The DEF tank then gets collapsed and cracked during the next DEF pump-out operation.

DO NOT fill DEF from a bulk fill pump. BMW dealers are notorious for doing this. A slow gravity fill with a funnel is safe to do. Only fill the passive tank so that you know that the transfer pump is working to keep the active tank filled.


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Last edited by n1das; 02-19-2019 at 01:16 PM.
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  #5  
Old 02-19-2019, 02:47 PM
Doug Huffman's Avatar
Doug Huffman Doug Huffman is offline
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Mein Auto: CPO2012 X5 35d M57(E70)
Quote:
Originally Posted by n1das View Post
Sounds like another case of the passive tank being filled from a bulk DEF dispenser and forcing DEF through the air stone vents from the "water hammer" effect when the tank reaches full. The DEF crystallizes and clogs the air stone vents. The DEF tank then gets collapsed and cracked during the next DEF pump-out operation.

DO NOT fill DEF from a bulk fill pump. BMW dealers are notorious for doing this. A slow gravity fill with a funnel is safe to do. Only fill the passive tank so that you know that the transfer pump is working to keep the active tank filled.
Gee Zeus, Glory Holy Julia, I believe.+1
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Scepticism and Animal Faith (1923)
Scepticism is the chastity of the intellect, and it is shameful to surrender it too soon or to the first comer: there is nobility in preserving it coolly and proudly through long youth, until at last, in the ripeness of instinct and discretion, it can be safely exchanged for fidelity and happiness.
(The Works of George Santayana p. 65)

Eschew eristical argumentation. I am responsible for what I write, not for your understanding of it.
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  #6  
Old 02-19-2019, 04:01 PM
m5e28s38 m5e28s38 is offline
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Thank you David and Doug,

During the last 50,000 miles, I have maintained car personally: diesel fluid filed through a funnel. First 35,000 it was maintained by the original owner at the dealership. So, I am sure they refilled it (I have previous owner records).

I am curious if the dealer will replace both tanks or just one. Will report when it is done.

Sasha.
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  #7  
Old 02-19-2019, 04:20 PM
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Doug Huffman Doug Huffman is offline
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I believe that the only errors possible from the passive SCR / DEF tank are level improbable errors, that there are no other sensors associated with that tank. The active tank has lots of possibilities.

The passive tank has a large area top and bottom surface, lots of unsupported plastic to flex on differential pressure due to clogged vents.

n1das may be recalling my description of the filling and service vents in the SCR / DEF system as sintered ceramic filters about the size of a cigarette filter, material similar to aquarium air stone bubbler.
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Scepticism and Animal Faith (1923)
Scepticism is the chastity of the intellect, and it is shameful to surrender it too soon or to the first comer: there is nobility in preserving it coolly and proudly through long youth, until at last, in the ripeness of instinct and discretion, it can be safely exchanged for fidelity and happiness.
(The Works of George Santayana p. 65)

Eschew eristical argumentation. I am responsible for what I write, not for your understanding of it.

Last edited by Doug Huffman; 02-19-2019 at 04:21 PM.
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  #8  
Old 02-20-2019, 10:44 AM
m5e28s38 m5e28s38 is offline
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So, they are replacing active tank only (16-19-7-244-138) because of a failed temperature sensor. Here is write up from the estimated invoice:

E C/S CHECK ENGINE LIGHT IS ON. ADVISE

I12 ENGINE ELECTRICAL SYSTEM

65 W942 (N/C)

1 16-19-7-244-138 ACTIVE TANK:169999 (N/C)
7 51-77-7-171-004 EXPANDING RIVET, BLACK:889520 (N/C)
1 07-12-9-952-109 HOSE CLAMP:889520 (N/C)
2 83-19-0-440-158 DIESEL EXHAUST FLUID ADBLUE:832516 (N/C)

86433 CHECKED ENGINE LIGHT NOT ON AT THIS TIME. HOOKED UP BATTERY
CHARGER. PERFORMED VEHICLE TEST. FOUND FAULT CODES 492C, 4BAC; DDE:
REDUCING AGENT ACTIVE TANK TEMPERATURE SENSOR, REDUCING AGENT ACTIVE
TANK FILL LEVEL SENSOR SIGNAL. PERFORMED TEST PLAN FOR FAULT CODE 4BAC.
PER TEST PLAN, NO PROBLEM FOUND, CLEAR FAULT. PERFORMED TEST PLAN FOR
FAULT CODE 492C. CHECKED LINES AND CONNECTIONS, OK. CHECKED TEMPERATURE
SENSOR, FOUND FAULTY. NEED TO REPLACE SCR ACTIVE TANK, COVERED UNDER
EXTENDED WARRANTY, 10/12O.
************************************************** **

I am sure happy that it is covered by the warranty.
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  #9  
Old 05-22-2019, 04:23 PM
NosieBoy NosieBoy is offline
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Sorry to resurrect an older thread, but my issue is nearly identical to the OP's. I'm getting both P203A & P205B fault codes now and I'm about 1,500 miles away from the 60k service interval according to my dash (62k on the Odo.) My question is; can I drive my X5 until the service interval is reached or do I need to have the SCR tank repaired immediately?

This is the second time that I've seen these fault codes. I got them to reset before by buying the 1/2 gallon BMW DEF bottle and putting it all into my passive tank. Recently, the 1,000 mile warning started up, so I bought a gallon of generic DEF, refilled my BMW bottle, and put another 1/2 gallon in the passive tank. The check engine light came on a few days later.
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Old 05-22-2019, 05:28 PM
ard ard is offline
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what '60k mile service interval'? I thought it is based on the car CBS system- like oil, brakes, etc. I dont recall seeing a 60k notice....

And PLEASE tell us you arent using a BMW dealer for self-paid maintenance.

__________________
Alignment here: The Definitive Alignment Thread

OE is Original Equipment aka 'BMW Original Parts' aka 'What you buy at the BMW dealer with a BMW label'

OEM is Original Equipment Manufacturer... EITHER the company that made the OE part or.... A part this is identical to the OE part, but is sold by the OEM under their own label


OEM is not what BMW sells


http://www.bimmerzone.com/category/T...ricks_OEM.html

https://www.turnermotorsport.com/t-OEvsOEM
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  #11  
Old 05-22-2019, 07:31 PM
NosieBoy NosieBoy is offline
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Mein Auto: 2012 X5 Diesel
Quote:
Originally Posted by ard View Post
what '60k mile service interval'? I thought it is based on the car CBS system- like oil, brakes, etc. I dont recall seeing a 60k notice....

And PLEASE tell us you arent using a BMW dealer for self-paid maintenance.

There is a 60k service interval in the manual for X5s. The exact mileage is set by the car's computer, but the recommended service is in the manual. Spark plugs and BMW's love of replacing the brake fluid, which I won't be having done, are two items that I recall reading about.

Yes, I will use my local dealer for this because I also have 3 recalls to get done. Two airbags and the engine idler pulley bolt, and I don't have time to drag my car to two different shops to save a few bucks.
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  #12  
Old 05-22-2019, 09:55 PM
ard ard is offline
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Location: Sierra foothills, California USA
 
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Mein Auto: '12 X5 35d/E39M5/996TTX50
Quote:
Originally Posted by NosieBoy View Post
There is a 60k service interval in the manual for X5s. The exact mileage is set by the car's computer, but the recommended service is in the manual. Spark plugs and BMW's love of replacing the brake fluid, which I won't be having done, are two items that I recall reading about.

Yes, I will use my local dealer for this because I also have 3 recalls to get done. Two airbags and the engine idler pulley bolt, and I don't have time to drag my car to two different shops to save a few bucks.
you are driving a diesel. They dont have spark plugs.
__________________
Alignment here: The Definitive Alignment Thread

OE is Original Equipment aka 'BMW Original Parts' aka 'What you buy at the BMW dealer with a BMW label'

OEM is Original Equipment Manufacturer... EITHER the company that made the OE part or.... A part this is identical to the OE part, but is sold by the OEM under their own label


OEM is not what BMW sells


http://www.bimmerzone.com/category/T...ricks_OEM.html

https://www.turnermotorsport.com/t-OEvsOEM
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