4.6is O2 sensor

[04e53x5]

Hello guys I have to replace my post cat 02 sensor on my 03 4.6is

Im trying to figure out is bank 1 driver side or passenger??

thanks guys

[bmw540san]

Passenger

[mam4.6]

She been throwing codes at you? What's your impression so far?

[Ricky Bobby]

How do you know its the o2 sensor? Have you scanned with DIS or a generic scanner? Many o2 sensor codes may also point to catalyst inefficiency, do you have any "marbles in a can" rattling from the exhaust at all?

[bcredliner]

Originally Posted by Ricky Bobby

How do you know its the o2 sensor? Have you scanned with DIS or a generic scanner? Many o2 sensor codes may also point to catalyst inefficiency, do you have any "marbles in a can" rattling from the exhaust at all?

Post cat focuses on reading emissions. The cause is often upstream rather than the sensor itself.

[Ricky Bobby]

^We are on the same page BC I've rarely seen an o2 sensor fail, but many o2 sensor codes thrown from other things.

[chivas]

don't you change the O2's every 100K in the M62's anyways?

[bcredliner]

Maintenance schedule for O2 sensors is 100,000 miles. The M62 engine schedule is the same as other models.