O2 Sensor Part#

[Bryan1]

I have a 2002 1150RT and was wondering if anyone knew the Bosch part# and where is the cheapest place to pick one up at? The dealer is a little on the pricey side and my search here didn't give me the result I was looking for.

[ltljohn]

Try here at beemerboneyard

[T__]

I have a 2002 1150RT and was wondering if anyone knew the Bosch part# and where is the cheapest place to pick one up at? The dealer is a little on the pricey side and my search here didn't give me the result I was looking for.

 

 

Bryan, some of the Bosch universal 02’s will work.. Depending on what connector your 02 has (BMW used 2 different types) there is a Bosch replacement for the round connector one (I believe) but it isn’t all that cheap ( Bosch 13067)..

 

Most of the universal 02’s use about the same sensor output & same crossover voltage but the two things you have to look out for are—

-Tip length,, due to fairly small diameter pipe the 02 screws into you really don’t want an 02 with a much longer tip..

-Heater resistance,, not sure how important the heater current usage on the BMW motorcycle is but when in doubt get it as close as possible.. Some auto applications it can make significant difference..

 

Pull your old 02 & head to your local auto parts store & look at the (pre cat) universal Bosch 02’s,, just compare the tip length,, then measure the internal heater resistance.. Get as close as you can & you should be good to go..

 

Try to get the universal 02 that uses the nice inline splice box with sealed connector.. You really don’t want to solder the 02 wire splices as that can cause problems if the 02 uses wire supplied ambient air for the comparator..

 

 

Twisty

 

 

[Bill Dennes]

Try www.EuroMotoElectrics.com

[smiller]

Out of curiosity why are you replacing the O2 sensor? Has it been confirmed/tested bad?

[Bryan1]

Well, the bike got to where it didn't want to idle when the engine was cold, not even with the fast idle lever. Took it to the dealer and they said every thing checked out good but I know something is still wrong. Then I was reading an article in a magazine where another fella was having the same symptoms with his BMW and he changed the O2 sensor and claimed that it fixed it. I haven't done any research yet on mine, just trying to get my ducks in a row.

[smiller]

The O2 sensor input isn't used by the engine computer upon startup and for the first few minutes of running. Hard to say with limited info but in your case I think the O2 sensor would be the last thing I'd suspect rather than the first.

[T__]

Well, the bike got to where it didn't want to idle when the engine was cold, not even with the fast idle lever. Took it to the dealer and they said every thing checked out good but I know something is still wrong. Then I was reading an article in a magazine where another fella was having the same symptoms with his BMW and he changed the O2 sensor and claimed that it fixed it. I haven't done any research yet on mine, just trying to get my ducks in a row.

 

 

Bryan, a couple of things to try that could point to a 02 related cold idle problem..

 

First thing to try & easiest to do (after last ride of the day or just before cold starting) is to remove the Motronic fuse for 30 seconds,, then re-install the fuse,, then turn the ign switch on (do not start the engine),, then fully open & close the throttle 2 times.. That will clear the Motronic’s fuel table memory offset & re-set the TPS.. The 02 sensor doesn’t heat enough to come on line & effect the cold operation for a good 30 seconds or in some cases even up to a couple of minutes so for the 02 to effect the cold idle it would have to have skewed the Fueling Computer’s last stored fuel table offset from the previous ride..

 

A better & more positive way to prove or disprove a corrupt 02 sensor at cold start up is to simply disconnect it at the connector (R/H rear side of the fuel tank).. The engine should run fine with the 02 disconnected so if disconnecting the 02 clears up the cold idle look for a failed or failing 02,, or the R/H spark plug wire running too close to the 02 sensor pig tail (there was a BMW service bulletin on this)..

 

If the 02 sensor disconnect doesn’t effect the cold idle then look else ware,, like mis adjusted fast idle cable,, oil temp sensor out of spec,, real thick engine oil,, maybe the AIT (air inlet sensor),, possibly your aftermarket fuel controller (if your bike has one),, low fuel pressure or leaking internal fuel line in the tank,, other fuel system or ignition system problems..

 

Twisty

 

 

 

[Bryan1]

Where is the Motronic's fuse located? I will definitely try some of these things. What is the fuel pressure supposed to be on these bikes?

 

This is a great forum with people who go out of their way to help others. Thanks to everyone for their input.

[smiller]

Do a basic tune-up, check cable adjustment, air bypass screw settings, etc. (all the boring stuff) first. It's always possible that it's something more exotic but the odds really are with it being something simple.

[T__]

Where is the Motronic's fuse located? I will definitely try some of these things. What is the fuel pressure supposed to be on these bikes?

 

This is a great forum with people who go out of their way to help others. Thanks to everyone for their input.

 

Bryan, it’s the 5th fuse in from the outside (should be a 10 amp)..

 

One thing I should have mentioned in my above post.. I have worked on a couple of 1150 RT’s for low or no cold fast idle & on both I found the fast idle cable sticking & dragging when cold.. I lubed the fast idle cable with Tri_flow Teflon based lube (don’t use any petroleum based lube as it can damage the cable liners) & removed the cable splitter box (a royal pain in the butt) & cleaned that of gunk & crud..

 

One thing to try that might show a sticking fast idle cable or splitter box is to hold the fast idle lever all the way up to the top of travel (up past the center detent),, then while still holding the fast idle lever all the way up use your right hand & open the throttle a couple of times.. That should take the load off the fast idle side of the throttle system & allow FULL fast idle travel.. If that helps the cold fast idle look for sticking fast idle cable/ splitter box..

 

Have you adjusted the fast idle cable a little higher? Little adjuster under the rubber cable cover right up by the fast idle lever..

 

Twisty