The Henchman wrote:
> "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.
>>
>> 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.
>
> I was planning on replacing the "fan belt" not the timing chain. Sorry
for
> the confusion.
You didn't confuse me. I was just offering that info. on the timing
chain (vs. belt) (along with my ongoing 2.7L experience as
encouragement) in case you weren't aware of it due to your mention of
your intention of getting more life out of it - I had not even noticed
your previous mention of the serpentine belt until now.
> ...What are your thoughts? Do people replace the O2 sensors on these
cars
> regularly?
No - only if they are suspect or actually failing.
> Also where is the PCV??? I need to replace that.
Located on top of intake plenum - connects to hose that comes from valve
cover. I advise getting that item from the dealer (some aftermarket
parts are suspect).
> Thanks for all the help!!
You're welcome.
From your post immediately preceding this one: "What is upstream and
what is downstream?" Same terminology used in rivers and creeks. Each
side of the engine has two O2 sensors - one precedes (is 'upstream' of)
the catalytic converter, the other one is after ('downstream' of) the
catalytic converter.
Bill Putney
(To reply by e-mail, replace the last letter of the alphabet in my
address with the letter 'x')
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