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Old 05-05-2016, 07:43 PM   #5
foamypirate
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Join Date: Apr 2009
Location: Pflugerville, TX
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Re: Mystery P0155 - tearing my hair out!

Quote:
Originally Posted by BR3W CITY View Post
I don't know "why" its being sluggish, but I'll tell you that the sluggishness is probably whats triggering the code. The ECM is measuring the time switching from open-to-closed loops, so if the singular sensor is slow or way off..it'll trigger the code.

Seems like you've already checked all the old suspects.
I ran a new log today where I let the O2s heat up before firing the engine. It (B2S1) didn't seem as sluggish (in fact, it seemed to heat up faster, possibly due to the Denso sensor having a lower resistance and allowing more current flow).

Here is the HPTuner log, if anyone is interested (right click, save-as). It honestly looks fairly normal to me in most instances, but it is slightly different than B1S1's pattern.

https://foamypirate.com/img/88chevy/...0155_50516.hpl
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