Quote:
Originally Posted by msammy
OK, so we were just handed our CT State emissions test form with big FAILED warning on it. Our 2002 X5 (original owners, VERY well maintained) has only 158K miles with many more miles left in her. OK, so I grabbed my phone, plugged in the OBD2 adapter and connected the Carly app to see what's going on. I'm reading the following code:
"Catalyst Efficience main cat. Bank 2" Code: 0000EA
OK, cool, also scanned with the Actron Pocket scanner and getting OBD code P0430.
I've searched this forum from top to bottom for similar codes, etc. and although finding a great deal of info, unfortunately each thread dies with no conclusive results.
So, from what I've gleaned from the various non-conclusive threads is this plan in this order:
Starting from the front of the X5 moving back:
o Replace air filter
o Clean MAF with MAF cleaner
o STOP, clear codes and see if OBD code comes back
--If so--
o Inspect and replace DISA valve if necessary
o STOP, clear codes and see if OBD code comes back
--If so--
o Replace both pre-CAT 02 Sensors
o STOP, clear codes and see if OBD code comes back
--If so--
o Replace both post-CAT 02 Sensors
o STOP, clear codes and see if OBD code comes back
--If so--
o Consider replacing both CATS at major expense or throw in the towel and part the old X5 out on Ebay/Internet.
So, recommendations/suggestions will be greatly appreciated. Our X5 has been part of the family for 15+ years with lots of memories but we don't want to spend more than She's worth in parts to keep her going! Maybe work backwards from the rear CAT sensors then forward would be a better approach???
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That's the parts cannon method of fixing the X. Keep throwing parts at it until the code don't come back.
What app are you using with the bluetooth scanner? If it's Torque or OBD fusion, they have a freeze frame in the app that takes a snapshot of the engine data (PIDS) when the computer throws up an SES or CEL light. When the engine throws up the another SES or CEL, look at the freeze frame before clearing the trouble code.
Before replacing the 02 sensors look to see if they are active when the engine is running and in close loop. Torque and OBD Fusion allows you to view the activity of the 02 sensors. If they are active then it's not a sensor problem.
Look at the long terms and short terms trim data when the engine is in close loop. If they are close to 0 then the engine is fine. Do a little bit of research before firing the parts cannon.