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Discussion Starter #1
I got the P2a01-o2 Sensor 1/2 Circuit Performance code yesterday. What causes this?

Went to the dealer and told the service manager about the codes. I told the g30 recall has been done and I been in regen quite a bit lately.

I told him I can't help the long idles, due to traffic. Also when I go into regen, and the egt gets pretty high, I don't want to shut it off, til it cools down a bit. He says that DC designed the 6.7 to be opperated as a no brainer. Just get in and drive, work it hard and don't idle to long. I asked him about cool downs for the turbo and he replied that the new turbo could withstand very high temp, above 2000 deg. :wow:

I said are you sure? he said yes. WOW that sounds far fetched to me. He said that regen is around 1400 deg. and the turbo should handle the high heat, even if you turn the truck off right away it is fine.

Is he wacked or does he know what he is talking about? :popcorn:
 

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He is a whack job.....1600 is about the max for the new 6.7....and that is not sustained. It will hit 1400 or more at regen....but to say you can turn the engine off at high operating working temps without cool down? No... like all certified dodge mechanics they know less about the trucks then we do....they just get paid to make mistakes on our vehicles. And as far as the idling goes....low idle ....regular idle is hard on them as the motor runs too cool and is unable to burn all the fuel....that is why they have the idle up enable feature....1200 rpm or so.
 

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This turbo can handle higher temps than the 5.9L. It is water and oil cooled. Not so sure about 2000F though.
 

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I've had that code a few times. Dealer changed out an O2 sensor and also cleaned some soot build up. I have heard rumors of new O2 sensors coming out soon and a flash update to solve this issue.
 

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Discussion Starter #6
That's what I thought, seems quite high for 2000 deg. I'll ask him to put it in writing that if I need a new turbo, they will cover all the costs, including a rental car. I still have a few years under warranty, but don't need the down time.
 
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