'94 945, non-turbo, Rex-Regina engine management:

I blew a heater hose the other day...the one connected to the cylinder head. (I probably weaked it when I changed my head-gasket a month ago, 'cause it split right at the head.)

The temp guage rose, but I noticed it within 90 seconds...it wasn't in the RED more than a mile.

Now all is repaired (new heater hoses and a new plastic heater valve, which broke when I touched it.) []

BUT

I now have a constant CHECK ENGINE lamp, when I pull the codes it reads 2-3-2, "Adaptive Heated O2 Sensor Control" OR "Lambda adjustment" (two problems are shown for that code).

I tried to reset it with the pigtail in socket 2, but I don't get the LED on the control box to stay on if I hold the button down. I can read the code OK obviously. (I have no problem getting the reset signal in socket 6.)

Has the coolant leak ruined my O2 sensor (the coolant leak soaked everything under the hood)?
OR
Could I have messed something up, fiddling around near the firewall on the drivers (LH) side of the engine bay?

Why can't I get the code to reset?

I have quit for the night but just want some guidance when I look at it again in the light of day.

TIA

 

I always have a hard time getting codes to reset.
I doubt the coolant messed the sensor up.
Try to reset it again.
I will see if I can find anymore info tomorrow.

I know the 2-3-2 code as a vaccum leak (Long term fuel trim)

 

Really, that could make sense since I removed the intake from the head to access the hose. (DID use a new gasket.)

Seems to run OK, not quite as well as before, but with the Check Engine lamp on it's in open loop, correct?

I'll look for an vacuum leak, maybe the flame trap didn't go back on.
Thanks...

 

OK, I did find that the flame trap main bottom hose was a little askew, but I don't think that was the problem.

I forgot I attempted to check the fuel injector spray patterns while the manifold was pulled back from the head, by turning the key on (engine off).

I bet that set the code.


I was able to reset the 2-3-2 code by removing the battery ground lead for a minute. (Downside was, I had to reset all the controls & settings on my new, very complicated radio.)[:@]


Drove 100 miles today, no check engine light!

 

Cool keep us posted.