[bmw] Re: bmw-digest V10 #156

[Carguymb@xxxxxxx]

Rick,

If your O2 sensors are more than 60k miles old, they almost certainly need
replacement.

My '95 M3 was a borderline emissions pass for a couple of years in the 50k
mile range.   After I replaced the O2 sensor (following a check engine light
and
pulling the code) it breezed through the next test, with no other changes.

Certainly worth trying before dropping the big bread on the converters....

Martin Bullen
'95 M3
'97 Z3 2.8

In a message dated 1/4/04 12:05:32 AM, owner-bmw-digest@domain.elided writes:


> Date: Fri, 2 Jan 2004 21:06:13 -0800
> From: "Rick Marz" <rick@domain.elided>
> Subject: [bmw] 750iL catalyst opinion...
>
> I have a high mileage 1991 750iL (227K miles) that just failed the
> California
> Smog II emission test.  This car was always well within emission limits -
10
> to 20% of max - but with the new Smog II dyno test it failed the low speed
> (15mph test) on both HC ppm; 134 vs the limit of 100, and NO ppm; 880 vs
the
> 740 limit.  It passed the 25 mph test  within limits.  Not way off the
> scale,
> but certainly failing.  The inspection station suggested that perhaps the
> catalytic converters needed replacement.  I feel that 227K miles is
> certainly
> a lot to expect out of the original converters, but would appreciate the
> opinion of this board as to whether to invest $800 in new converters and
> re-submit to the test, or if something else might be suspect.  The car
> recently had the Inspection II (within the last 4000 miles) which replaced
> plugs, filters etc, so should be well within tune-up specs.
>
> Question two, if the catalytics are replaced, should the oxygen sensors be
> replaced as well.  I think they have only been replaced once in the 227K
> miles.
>
> Appreciate any comments you can provide, this has always been a very
> knowledgeable board.  What would you do?
>
> Rick Marz
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