On Friday, August 3, 2018 at 11:40:50 PM UTC-4, Arlen Holder wrote:
On 3 Aug 2018 19:55:41 GMT, Clare Snyder wrote:

That is possible - definitely check for leaks - but now at least he
knows if the light comes on again he DOES have a problem. The sensor
definitely needed to be fixed, either way.

Unfortunately I don't remember the code. But it was related to the oxygen
sensor, but I should have written it down. P0133 perhaps? I don't remember
though. So I apologize not to be able to provide that fact to you.

There is also a code for the O2 sensor heater. That's the common failure on the BMW here. They don't work unless they are hot, so to get it working faster with a cold engine the sensors have heaters.






The good news is that a new code, if it pops up, will tell me something
since the sensor is new (and they don't last forever).

800 RPM hot idle does not necessarily sound like a problem - and a
bad sensor cannot get the computer to adjust the mixture properly.

I agree. The 800 is fine as an idle speed. But it does stall. So, there's
something wrong when it transitions from cold to warm. Dunno what yet. A
cost-effective smoke machine is something I've always wanted ...

(I built one, but it sucks.)

I've seen stories of people using disco smoke machines that you can buy on ebay.





Need to check the block learn readings etc to know for sure , but too
rich or too lean should give rich or lean codes, not out of range
codes. Out of range means voltage higher or lower than normal
operating range, and generally static - not clocking. Too lean means
violtage higher than optimum - too rich means voltage too low .

As I recall, there were no misfire codes and no lean condition codes.
Just the O2 code (might have been a cat code, I wish I remembered it.)

Maybe it will be back soon. How old did that previous sensor look? Possible that there is another problem and it's not the sensor,so some hack changed it recently. Did anyone check out this car before buying it to make sure it wasn't a lost cause?



Too lean would generally be a P0171, or P0174.
Too rich would be P0172 or P0175.

Yup. None of those. Since I own a bimmer that is almost two decades old, I
know all about lean condition codes.

This code was cat or sensor specific. But let's see if it comes back.


A bad sensor would generallly be a P0130 to P0170 - but other problems
can cause these codes as well.

Yup. Chasing codes is always fun. Not.