O2 Sensor life expectency

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Oct 11, 2005 | 02:13 PM

JJCNSX

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O2 Sensor life expectency

hi all,

i am currently getting 20~21MPG (combined city/highway) on my 98.5 2.8Q V30 with 112k miles.. It's 5spds, i drive fairly gentle..

I am wondering if i should replace the 02 sensors, but, they are about $150 a piece, and 3 of them (2 pre cat, 1 after) are about $450.... They said the life expectancy on 02 are about 90k miles...

Should i replace them or not? I dont see CEL on 02 sensor (i do see CEL on knock sensor and 2ndary air injector..) Would i see any improvement on gas mileage?

-jjc.

Oct 11, 2005 | 02:14 PM

Keyless Chuck

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Check out Bosch4less.com

Oct 11, 2005 | 02:20 PM

JJCNSX

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thanks!! still pricey though..

which one should i get? there is two different P/N (OE- Downstream).. http://bosch4less.com/index.cfm?display=display_result.cfm&xmake=AUD I&xmodel=A4%20QUATTRO&xyear=1998&xcyli nders=V6&xsubmodel=&xliters=2.8&xfuel= GAS

not sure which one i should get for my 98.5 30v 2.8Q..

-jjc.

Oct 11, 2005 | 02:28 PM

BSK

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after 100k i would change them

Oct 11, 2005 | 02:53 PM

JJCNSX

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How many 02 sensor do we need?

i thought it was 2 before cat, and 1 after..

but, it seems like there are left/right (brown/green)after cat.....'

does that mean i need 4 02 sensors?

****tt...

-jjc.