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Re: [Shop-talk] High Hydrocarbons

Subject: Re: [Shop-talk] High Hydrocarbons
From: "Randall" <>
Date: Wed, 28 Aug 2013 10:51:57 -0700
Cc: <shop-talk@Autox.Team.Net>
Thread-index: Ac6kC4E66O7EJ0sMRqaly2vOqN8JkAAB8Hqw
> I would think if the O2 sensor was out of range it would turn 
> on a check
> engine light.

I agree, if the ECU has gone into limp mode, then it will certainly light
the trouble light.  But, O2 sensors usually fail gradually, so it still may
be that a new sensor will improve tailpipe emissions.

>I was pleased to learn that my daughter's 91 E30 
> BMW had a
> procedure where you short 2 pins on thier special BMW 
> interface connector to
> enable a check engine light blinking capability where you 
> could read the
> codes. 

I think that has been a standard feature, ever since trouble codes were
invented.  In addition, most cars have a magic sequence that will flash the
codes (or at least a subset of them).  I forget the exact sequence for my GM
car offhand, but it's something like hold the accelerator partway down and
turn the key on-off-on-off-on with a 2 second pause in each position.


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