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Old 06-16-2013, 03:37 AM   #21
ubersaloon
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Join Date: Jun 2008
Location: Adelaide, Australia
Posts: 172
My Ride: 2001 325i, E34 M5
An update to this for anyone interested.

I got Bosch OEM sensors with the correct lead lengths from OS. They were under $90 ea with free shipping so pretty good value compared with local and dealer prices. Also bought an O2 sensor removal tool from Repco which is essential.

Removal and refit of the front sensor is pretty straightforward but the rear one is very difficult due to the angle of the sensor in the RHD-specific manifold and also the proximity of the steering gear and A/C pipes. LHD DIY's will not tell you this. It doesn't help when your hands are the size of Mark Schwarzer's either.....

In the end a very specific socket wrench and extension combo got the job done and they were both pretty easy to loosen with the wrench then remove by hand. New ones already had a smear of anti-sieze compound on the threads so went straight in.

Only driven about 15km total but consumption is already showing 11L/100km. I've never seen sub 12 city cycle so at that rate the sensors will have paid for themselves in about a year.
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Old 06-16-2013, 04:36 AM   #22
KOpower
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Join Date: Mar 2012
Location: Sydney, NSW
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O2 Sensors

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Originally Posted by PerfectStorm01 View Post
So this morning I called BMW and they wanted over $1000 for both o2 sensors, which they didn't carry and would have to source from Germany.

Dun knw whether to laugh or cry


Question - I knw they recommend O2 sensor change @160km or so - but how long can they really last? Maybe u can still get upto 200,000km out of em?




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Old 06-16-2013, 05:02 AM   #23
ubersaloon
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Location: Adelaide, Australia
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My Ride: 2001 325i, E34 M5
They could probably last indefinitely as in they will 'work' and not throw a fault code but from what I've seen today, new ones work a lot better.
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Old 06-16-2013, 05:51 AM   #24
PerfectStorm01
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Join Date: May 2012
Location: Melbourne, Australia
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Quote:
Originally Posted by ubersaloon View Post
An update to this for anyone interested.

I got Bosch OEM sensors with the correct lead lengths from OS. They were under $90 ea with free shipping so pretty good value compared with local and dealer prices. Also bought an O2 sensor removal tool from Repco which is essential.

Removal and refit of the front sensor is pretty straightforward but the rear one is very difficult due to the angle of the sensor in the RHD-specific manifold and also the proximity of the steering gear and A/C pipes. LHD DIY's will not tell you this. It doesn't help when your hands are the size of Mark Schwarzer's either.....

In the end a very specific socket wrench and extension combo got the job done and they were both pretty easy to loosen with the wrench then remove by hand. New ones already had a smear of anti-sieze compound on the threads so went straight in.

Only driven about 15km total but consumption is already showing 11L/100km. I've never seen sub 12 city cycle so at that rate the sensors will have paid for themselves in about a year.
Nice job. You don't waste any time...get them Friday installed by Sunday. Was it a "special" o2 sensor tool or anything repco carries should do?

I saw the anti seize on the ones I got...nice touch. My anti seize is reserved for my fan.

Let us know how the sensors work out over the next few days.
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Old 06-16-2013, 05:53 AM   #25
PerfectStorm01
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Quote:
Originally Posted by ubersaloon View Post
They could probably last indefinitely as in they will 'work' and not throw a fault code but from what I've seen today, new ones work a lot better.
+1.

O2 sensors are 160km maintenance item.
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Old 06-16-2013, 06:21 AM   #26
Mflara20
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Join Date: Apr 2012
Location: Elgin illinois
Posts: 431
My Ride: 2002 330xi
O2 Sensors

Quote:
Originally Posted by ubersaloon View Post
An update to this for anyone interested.

I got Bosch OEM sensors with the correct lead lengths from OS. They were under $90 ea with free shipping so pretty good value compared with local and dealer prices. Also bought an O2 sensor removal tool from Repco which is essential.

Removal and refit of the front sensor is pretty straightforward but the rear one is very difficult due to the angle of the sensor in the RHD-specific manifold and also the proximity of the steering gear and A/C pipes. LHD DIY's will not tell you this. It doesn't help when your hands are the size of Mark Schwarzer's either.....

In the end a very specific socket wrench and extension combo got the job done and they were both pretty easy to loosen with the wrench then remove by hand. New ones already had a smear of anti-sieze compound on the threads so went straight in.

Only driven about 15km total but consumption is already showing 11L/100km. I've never seen sub 12 city cycle so at that rate the sensors will have paid for themselves in about a year.
Can I have a link where you bought them from.


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Old 06-16-2013, 06:35 AM   #27
ubersaloon
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Location: Adelaide, Australia
Posts: 172
My Ride: 2001 325i, E34 M5
Yeah, was pretty keen to see how they went. I've had a couple of issues that I've thrown a lot of time and effort at and nobody has been able to solve. I'm cautiously optimistic this has nailed at least one of them. The fuel consumption improvement if it lasts, is a bonus.

I think the tool is the ONLY one Repco sell - wasn't that expensive.

The hardest bit was trying to unclip and reclip the wire for the rear sensor back onto the manifold heatshielding. In the end I couldn't quite get the one right at the back of the engine in but using a mirror I could see it was still well clear of the manifold. The A/C pipe is what gets in the way the most.


Quote:
Originally Posted by PerfectStorm01 View Post
Nice job. You don't waste any time...get them Friday installed by Sunday. Was it a "special" o2 sensor tool or anything repco carries should do?

I saw the anti seize on the ones I got...nice touch. My anti seize is reserved for my fan.

Let us know how the sensors work out over the next few days.
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Old 06-16-2013, 06:39 AM   #28
ubersaloon
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Join Date: Jun 2008
Location: Adelaide, Australia
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Quote:
Originally Posted by Mflara20 View Post
Can I have a link where you bought them from.


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PM'd.
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Old 06-16-2013, 08:00 PM   #29
trive2
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Yay! At 200,000km I am due for all four 02 sensors *facepalm*. I had been putting them off, pretending I wasn't due yet- but I knew the truth.
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Old 06-16-2013, 09:50 PM   #30
ubersaloon
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Location: Adelaide, Australia
Posts: 172
My Ride: 2001 325i, E34 M5
Easy tiger....
The post-cat sensors may not need replacing because apparently they only monitor CC health.
They are supposedly nowhere near as important for engine running as the pre-cat sensors.
That is of course if you have post-cat sensors.
See my earlier post about the empty leads on top of the engine.
I haven't specifically looked underneath my car for post-cat sensors but I wouldn't be surprised if there were none.
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Old 06-17-2013, 12:57 AM   #31
trive2
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I definitely have post cat sensors. That's interesting, because I was considering having my cats removed/replaced and was wondering if the change in emissions would cause any running problems.

I will look into it further. I do not like Catalytic converters. I'm trying to figure out how I can weld out the pre-cats out of the top...
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