"Bill Putney" <bptn@[EMAIL PROTECTED]
> wrote in message
news:5ua06eF1gncrrU1@[EMAIL PROTECTED]
> The Henchman wrote:
> > I have a 2004 Sebring Touring 2.7L with almost 100 000kms (60
000miles).
> > Gas mileage has suffered recently. Check Engine light has been on and
I
have
> > scanned it...
> >
> > I have an OBDII error code of 0137. Am I correct that is the oxygen
sensor
> > on the driver's side of the tail pipe that is faulty?
>
> It is the downstream sensor on the bank that is the side of the engine
> that the a.c. compressor is on (opposite side from the power steering
pump).
>
> > I'm taking the car in to have a tyranny flush and new serpentine belt
done,
> > should I just have the dealer replace all 4 Oxygen sensors or replace
the
> > faulty one. The cost of the oxygen sensors is $47 each from the
dealer,
not
> > including the labor which was half the price from several auto parts
dealers
> > in my area.
> >
> > Would their be any benefits to replacing all 4 oxygen sensors?? I
really
> > want to get another 100 I kames (60 K miles) from this car.
>
> The downstream O2 sensors only monitor catalytic converter health, and
> are not in the closed loop engine controls like the upstream sensors
> are. So that one sensor would not affect fuel mileage. However, the
> upstream sensors *could* be causing poor mileage without setting a code,
> but they aren't necessarily the cause of the poor mileage.
>
> FYI - my daily driver is a Concorde with the same engine in it - it has
> 190k miles on it and is on the original O2 sensors, and gets 26 to 28
> mpg on my 80 mile daily commute (gets over 30 mpg on continuous
> interstate driving). And the Concorde is a much heavier car. BUT -
> something is causing your poor mileage - could be the O2 sensors, but
> not necessarily. So it would be a gamble either way.
>
> Maybe someone else can offer ideas on how to rule them out as the cause
> of the poor mileage, or whether the gamble would be in your favor by
> just going ahead and replacing them all. BTW - *DO* get the sensros
> from the dealer. While there are some good sensors in aftermarket,
> unless you know which brands are the good ones, you're likely to get
> really bad ones - even among some respected name brands (hint - Bosch no
> good, NGK are good). If you do go aftermarket, make sure you get ones
> that come with the factory-type connectors already installed, otherwise
> you would have some splicing to do.
>
> As long as you religiously change the oil at less than 4000 mile
> intervals, you should be able to get another 60k miles out of the
> engine. Like I said - I'm at 190k miles and running strong (however, I
> do need new exhaust valve seals, which do tend to typically be required
> somewhere beyond 110k miles on this engine, and manifest themselves in a
> code that says the catalytic converter is not working efficiently - code
> P0420 or P0432, which means the catalytic converter is shot due to too
> much oil in the exhaust).
>
> As you may know, this engine has a timing chain instead of a belt, so
> there is no change interval on that. HOWEVER, the water pump is run by
> the chain, and the pumps have been known to fail.
>
> > Thanks for the input!!
>
> You're welcome!
>
> Bill Putney
> (To reply by e-mail, replace the last letter of the alphabet in my
> address with the letter 'x')
Not true. The first purpose of the downstream 02 sensor is to measure cat
efficiency. The second function is downstream fuel control. This function
adjusts the upstream 02 goal voltage within the range of operation of
the
upstream sensor. The upstream goal voltage is used to ensure long cat life
by allowing the pcm to control the amount of air and fuel that is supplied
to the cat. If the downstream 02 sensor switch point is at a low voltage
the Pcm will adjust the upstream 02 goal voltage to reduce high 02
content
by . If the downstream 02 sensor switch points stays high, the upstream
02 sensor goal voltage will change and allow a low 02 content.
Glenn Beasley
Chrysler Tech
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