Onebad S4

So a little background. Car has had a misfire problem at idle for some time now, change a TON of stuff, but never 02s because i wasn't getting any codes for them.Could 02's cause the msifiring at idle? Here they are, please let me know what you think if you have time. I am unsure what 02s need replaced. Thanks guys..

16805 - Warm Up Catalyst; Bank 1: Efficiency Below Threshold
P0421 - 35-00 - -
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-00 - -
16688 - Cylinder 4: Misfire Detected
P0304 - 35-00 - -
16687 - Cylinder 3: Misfire Detected
P0303 - 35-00 - -
16518 - Oxygen (Lambda) Sensor B1 S1: No Activity
P0134 - 35-10 - - - Intermittent
16538 - Oxygen (Lambda) Sensor B2 S1: No Activity
P0154 - 35-10 - - - Intermittent
17539 - Oxygen (Lambda) Sensor; B2 S1: Internal Resistance too High
P1131 - 35-10 - - - Intermittent
16686 - Cylinder 2: Misfire Detected
P0302 - 35-00 - -
16689 - Cylinder 5: Misfire Detected
P0305 - 35-00 - -

Tifosi

Looks to me like both front O2s are done. But, list the parts you have replaced already ?

daves4izzle::ASP 3-

Please replace both primary o2 sensors, clear codes, and report back.

lazy n00b

I replaced both front O2 sensor today and the car runs so much smoother. I would recommend it

Onebad S4

unpluged maf..etc..Are the front 02s the primary? Are all 4 of the 02s the same im assuming? Car has 150k on it, so it wouldn't surprise me if they were bad.

And one more thing, Are they a pain to install?

lazy n00b

You probably want to DIY considering my warranty covered mine and the bill was $625

Onebad S4

Oh thats lovely..