CEL, Code P2629, 2 o2 sensor replacements.. Why? - Mustang Evolution

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Old 09-11-2014, 03:43 PM   #1
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CEL, Code P2629, 2 o2 sensor replacements.. Why?

Can't figure this car out..

Had a flowmaster outlaw axleback on, no check engine light.
Put on a summit after cat X pipe, check engine engine.
Removed x pipe, check engine light.
Back to complete stock exhaust, check engine light.
Everything the ob2 scanner was on, battery was disconnected and codes were cleared.
Black soot on both exhaust tips all the time.


Got an aftermarket o2 sensor, light stayed off for 3 weeks.. Came back on and said it was a permanent code.. Got an AirRaid cold air intake and got had a hesitation. Removed that and put the stock o2 sensor back in. Drove better..

Went to Ford and they installed a new o2 sensor and updated my ecm... Drove PERFECT and so smooth until the check engine light came back on and showed this code, 40 miles after leaving the dealer.

... P2629
O2 Sensor Pumping Current Trim Circuit/Open Bank 2 Sensor 1


The car started having its sluggish low rpm and take off power, as it did before..

CAN NOT figure out why I keep getting this code and what the problem could be.. Anyone have any input or ideas?????
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Old 09-11-2014, 05:57 PM   #2
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They replaced the front o2's? Don't push the car hard until you get this figured out.

What exactly was done when you put the Summit x-pipe on? Any extensions? Anything done with the wiring?
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Old 09-11-2014, 06:02 PM   #3
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Nothing at all. Wasn't touched.. it was an after cat x pipe

---------- Post added at 07:02 PM ---------- Previous post was at 07:01 PM ----------

They replaced the front left o2
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Old 09-12-2014, 05:57 AM   #4
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CEL, Code P2629, 2 o2 sensor replacements.. Why?

Did you unhook the battery for 15 min the hook it back up. Maybe the car needs to learn the new parameters with more airflow.

Never mind I posted without fully reading the original post.


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Old 09-12-2014, 08:43 AM   #5
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Are you sure nothing was tweaked or pinched in the front harness for the o2's? That to me is where the problem is since you're getting codes even with the stock exhaust.
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