Check engine light on with multiple codes P2063, P21A8, P2620 and P2621

Tiny
NASER NASER
  • MEMBER
  • 2009 BMW X5
  • 6 CYL
  • TURBO
  • 4WD
  • AUTOMATIC
  • 205,000 MILES
Car drives fine with no symptoms. I wanted to see if you have any suggestions. Check engine light is on.
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Friday, September 11th, 2020 AT 2:23 PM

12 Replies

Tiny
4DRTOM
  • EXPERT
Hello,

if you have no symptoms I would erase the codes and see if the light comes back. It could be a stored code that has already been taken care of. Is this car diesel?
Tom
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Friday, September 11th, 2020 AT 7:57 PM
Tiny
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  • MEMBER
Erased it and it came back, it had more codes but these are what is left over. Yes sir a diesel.
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Friday, September 11th, 2020 AT 7:59 PM
Tiny
4DRTOM
  • EXPERT
Check your DEF temperature sensor.
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Saturday, September 12th, 2020 AT 8:00 AM
Tiny
NASER NASER
  • MEMBER
Where is the def sensor, how do I check whether it is functioning?
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Saturday, September 12th, 2020 AT 8:12 AM
Tiny
4DRTOM
  • EXPERT
Hi,

I'll shorten it and reword it to basic. A temperature sensor in the exhaust pipe ahead of the metering valve measures the exhaust gas temperature. The injection mixture starts when at least 200 C is measured here. The sensor is located before the SCR catalytic.
So much for the detailed system explanation but the basic thing is that you need to check both the Throttle Position Sensor and the DEF system temperature sensor. Then all the basic connections at the plugs and the normal things you would go through. Melted wire from hitting the exhaust system and the like.
Hope this works
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Saturday, September 12th, 2020 AT 11:18 AM
Tiny
NASER NASER
  • MEMBER
Nice diagram. Which would be the front side of the car in the diagram?
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Saturday, September 12th, 2020 AT 11:27 AM
Tiny
4DRTOM
  • EXPERT
Hi, The left side should be side towards the motor.
Tom
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Saturday, September 12th, 2020 AT 9:42 PM
Tiny
NASER NASER
  • MEMBER
Deleted all codes and only code P21A8 is back, is it possible that an empty passive tank can cause this? I was thinking since this is the passive tank and is the one that fills the active tank and since there is no active tank code yet that maybe the passive is low. Also read that it could be one of the sensors in the passive tank either the top or lower one that are bad, wiring, etc.
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Wednesday, October 7th, 2020 AT 10:17 AM
Tiny
NASER NASER
  • MEMBER
Do you know what this could be a result off? Does the DEF fluid gets frozen after left outside if there is a leak and makes what looks like ice? It looks like someone may have been there before already, but no other leaks very clean and dry car on bottom, very strange with 205,000.
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Tuesday, October 13th, 2020 AT 12:23 PM
Tiny
4DRTOM
  • EXPERT
Hi Naser,

It was leaking at some point if not currently, Is that frozen in the pic? Either way that connector is most likely compromised. Did you pull it apart to check?
Tom
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Wednesday, October 14th, 2020 AT 8:24 PM
Tiny
NASER NASER
  • MEMBER
Looks like it was a leak and that frozen stuff, not cold of course, looks like it maybe def fluid. No not sure what to check for I did not see a temperature sensor yet.
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Wednesday, October 14th, 2020 AT 8:31 PM
Tiny
4DRTOM
  • EXPERT
Hello,

Disconnect the plug shown and look at the pins inside and make sure there not corroded or anything but nice and clean and the female side that the holes aren't stretched out. If at some point it did in fact freeze or while the Def fluid dried out female part could have expanded the terminals so the male part doesn't fit nice and tight. Definitely check to see that the male pins are fitting tightly.
Tom
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+1
Thursday, October 15th, 2020 AT 9:08 PM

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