Extending post cat sensor wires

[Steeler]

Anyone have any experience with this?

I have read posts on other boards where there are concerns with
1.Ohms resistance dropping because of longer wires.
I wil be extending 12"
2.Concerns with soldering the connections because some wiring is not copper.
Is our wiring copper?

[Walkurie]

If you are extending to accomodate the post cat sensors from either a modified stock CAT or the Euro CAT, have you tried the basic procedure for relocating the wires? This usually works well. At least it did for me.

http://www.zpost.com/forums/showthre...&highlight=EGT

[Steeler]

Thanks for the link.
I did reroute the wiring as in the video.
Will try to get a bit more slack before attempting a spliced in piece.

[seank]

I remember adding 24" and it still was barely long enough. Just use some string and route it. Then measure the string.

[johanness]

Don't cut - unfold.

[Steeler]

Originally Posted by johanness

Don't cut - unfold.

This /\ .......one lead is already longer so chances are there is slack bundled somewhere in the loom

Take a look this weekend

[Shipkiller]

Originally Posted by dbarton62

Anyone have any experience with this?

I have read posts on other boards where there are concerns with
1.Ohms resistance dropping because of longer wires.
I wil be extending 12"
2.Concerns with soldering the connections because some wiring is not copper.
Is our wiring copper?

Increasing the wire length does not reduce the resistance. It actually increases the overall resistance of the circuit.

Wire does not have to be only copper so effectivly 'solder' the connections. There are differnet types of 'solder' and 'flux' for different materials.

[SCHMOUPE]

dont cut. ask me how I know.

[JeffchaPz]

Don't cut 'em... ask him how he knows....

I pretty much damage mine by cutting them. I ended up buying a pair after months of troubleshooting. $370 mistake

[RobMCoupe]

I have Euro headers by rerouting over the transmission tunnel. It is not long enough to route properly. You need to get Euro O2.

[Devious21]

Originally Posted by JeffchaPz

Don't cut 'em... ask him how he knows....

I pretty much damage mine by cutting them. I ended up buying a pair after months of troubleshooting. $370 mistake

The shop that did my header install did cut them. I gave them all the info to extend and when they went to do it, they said they were over a foot short still.

Basically they cut them and now I'm getting strange codes everytime I fill up. I have a feeling my 02s are the culprit.

What led you to replace them? Did you do any troubleshooting to narrow it down or just bought them blindly?

[Devious21]

Originally Posted by RobMCoupe

I have Euro headers by rerouting over the transmission tunnel. It is not long enough to route properly. You need to get Euro O2.

Do you have part # / source for Euro 02?

[RobMCoupe]

Part number from RealOEM. I haven't look into where to source them recently. Most like will be eBay.

09 OXYGEN SENSOR BOSCH/L=1390MM 1 11787837564
10 OXYGEN SENSOR BOSCH/L=1340MM 1 11787837565

[Jumbosock]

Originally Posted by Devious21

Do you have part # / source for Euro 02?

These are the part numbers for the Euro O2 sensors:

OXYGEN SENSOR BOSCH/L=1390MM 1 11787837564
OXYGEN SENSOR BOSCH/L=1340MM 1 11787837565

These are the part numbers for the North American O2 sensors:
OXYGEN SENSOR BOSCH/L=1075MM 1 11781406621
OXYGEN SENSOR BOSCH/L=935MM 1 11781406622

[seank]

Originally Posted by Devious21

Do you have part # / source for Euro 02?

You can't get them, unless you have someone over there buy them and ship them to you. BMW does not allow parts to knowingly come into the country 2 years ago.

[johanness]

Originally Posted by RobMCoupe

I have Euro headers by rerouting over the transmission tunnel. It is not long enough to route properly. You need to get Euro O2.

This is not true. You didn't route it correctly then, because there IS enough length with our good 'ol US ones.

[Jumbosock]

If you watch the videos that I posted, I mention that you can't get fancy with the routing of the wires. You have to keep the route straight. I've often wondered if some wires on certain production years are shorter than others because I have heard some people say the wires won't reach. For that reason I don't say for sure that it will reach because I can't say for sure that all cars have the exact same wiring. I just know that for my car it reached and I have not had any problems whatsoever.

On a second note. I'm wondering if people should consider using the 1075mm length O2 sensor on both sides instead of using the 935mm length version. I don't *think* it would be a problem having two of the longer ones. I know for me the 935mm length side was the one that was a tad tight. Assuming the connections are all the same, the added length would help. I am almost 100% certain the connections are all the same.

[RobMCoupe]

Originally Posted by johanness

This is not true. You didn't route it correctly then, because there IS enough length with our good 'ol US ones.

I did not have to extend my O2 sensors by routing over the transmission. Euro O2 sensors are require to route it properly per manufacturer.

[johanness]

Originally Posted by RobMCoupe

I did not have to extend my O2 sensors by routing over the transmission. Euro O2 sensors are require to route it properly per manufacturer.

If you want to wire your O2's the LONG way (which is completely unnecessary), then technically - yes.

But going through the cost and pain in the ass of ordering from the EU isn't needed IMO. Everyone I've spoken with who has Euro headers and have 'unfolded' their O2's have had success (read: enough length so everything connects well, with no melted wires and/or other issues).

[Walkurie]

What may be confusing for some people doing this conversion is that when unfolding the wires, one also needs to cut the loom way back to an area near the brake servo (on LHD cars) and then ROUTE THE WIRES ALONG THE DRIVERS SIDE of the engine. Have to admit it took me a bit of time to watch the video, re-watch it, and then try the whole process. If one still needs the extra length and wants to go to the Euro part numbers, try contacting these people.

http://euroactiveparts.com/OEM_BMW_accessories.php

They were able to source my Euro cats. Very easy process, came right from the OEM BMW parts distributor with no additional duty charges.

[RobMCoupe]

Link bookmarked. I plan on getting Euro O2 when I change at 100k.

[inTgr8r]

Are the Euro O2s the same otherwise? (sensor spec)