35d Reducing Agent Passive Tank Sensor Failure

[johnmn]

Hi all,

Been lurking here for a few years and have found some great info. Thank you. I searched for my current issue, but didn't find much. Here's the problem:

'09 X5 35d. 59k miles. SES light on. Dealer diagnosis:

"Hooked up charger and performed a vehicle test. Found fault 4BCC for reducing agent passive tank fill level signal. Fault is currently present and has occurred 40 times. Followed test plan. Removed the undershield and checked connector at passive tank. Connector is OK. Test plan concluded the passive tank is faulty and needs to be replaced. Sensor is located in tank and tank needs to be replaced with sensor reading inside of it."

They recommend replacing the passive tank, part number BM16-19-7-22-146. $2,400 installed, out the door.

I declined repairs. Has anyone dealt with alternatives to replacing the tank to fix a faulty level sensor? If you did replace the tank, was it fairly straightforward?

Thanks!