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Lambda sensor retrofit - 99 exhaust on a 2006


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Finally got my 2006, and traded an Akra full 4-1 system for a stock exhaust from a 99. Now i just need to get the lambda sensor in place, and need to get some stainless nut welded in place, enabling the sensor to be screwed in. But i am not able to figure out where to get a nut with the correct threads. Measuring diameter across the threads of the sensor the caliper shows excactly 12mm. The threads seems not to be metric though; the SAE 20 gauge fits perfectly. 

 

Anyone who knows something helpful about this?

 

(Sensor delete is not an option, I am going for stock but without the cats)

 

 

Edited by Muffinman
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m12x1.25 . Just get O2 bung on ebay, amazon, etc.

Make sure it is small one unlike old school m18x1.5

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Google "o2 sensor bung", you'll find plenty of them.  Look at where a stock one is mounted and copy that, the location and angle doesn't have to be 100% exact, but it's somewhat important.

 

There's also clamp on o2 bungs to avoid welding, but I don't know if that would work on a Bird's header.

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I disconnected the o2 sensor on my 06 with an o2 eliminator plug as it was causing the engine to surge.i want to fit earlier mufflers without catalytic converters on it next.

 

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2 hours ago, poida said:

.i want to fit earlier mufflers without catalytic converters on it next.

You could just break the catalytic converters and dump out the pieces.

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Posted (edited)
8 hours ago, rockmeupto125 said:

I believe it is 12x1.25 and you should be able to buy a regular bung rather than using a nut.

 

Search lambda sensor bung.

Agreed on the bung. Disconnected the sensor to take it with me shopping.  

 

But the thread gauge for 1,25 does not fit the threads on the sensor. Strange if it is supposed to be 12x1.25.

 

EDIT: Beginners mistake. New thread gauges, and it appears the 1.5 blade and the 1.25 was stuck together. 12x1.25 is correct and it should be pretty easy to get a bung that fits. Have a few shops that may have these in stock nearby.

Edited by Muffinman
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Seems it is not so straightforward to get a suitable bung right away, så I am left with the choice between assembling the bike without the o2 sensor for now postponing the weld until winter, or leaving the bike unusable for days while waiting for the bung to get delivered. And those are my days off work...

 

So, I it is probably not a good idea to run the bike with the sensor connected not in the exhaust. But what happens if the bike is started with the sensor disconnected entirely?

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Sensor is there to keep afr in certain areas of fuel map around 14.7. It will be in closed loop mode in steady low to low-mid loads like cruising but not idling, accelerating or going WOT. If you disconnect, it is going to operate in open loop, probably richer than before in areas of engine operation I've mentioned before. You are gonna be fine, mpg might drop somewhat plus ecu light on the dash will be on.

Edited by tomek
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Thanks for your replies, they are really helpful! 

 

I had surges and rough engine @2700rpm earlier until I dropped a zeromap in the PC. Immediately became smooth as silk. Will leave the PC in there for a while in case something needs to be adjusted.

 

Solution: Got a M18x1,5 bung which is going to welded in soon allowing me to assemble the bike and make it usable with the bung capped and the sensor disconnected for now. Also ordered an adapter to M12x1,25 which should arrive later. Will install the sensor then.

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Beware that if the bung and adapter put the sensor out of the exhaust stream it won't read the same.

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  • 2 weeks later...

Still waiting for the bung adapter, but welding the 18x1,5 was successful and the bike is now running very well with the sensor disconnected. Getting the FI light as expected, but also the fuel gauge seems to not be working. The last indicator bar keeps flashing when the bike is running, not displaying tank level. Maybe i accidentally disconnected the fuel gauge connector when disconnecting the 02 sensor, or could this be a part of the fault indication caused by the missing 02 sensor?

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I can't imagine there being any connection between the O2 sensor and the fuel level.  I think the level sensor connector is under the seat near the tank.

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  • 1 month later...
Posted (edited)

Appears I forgot to replug the fuel gauge connector and it is working now. Anyway, 02 sensor is  in place and bike is running perfectly with the non-cat 1999 exhaust with the retrofitted sensor. Smooth as silk, no surging and fuel consumption dropped to a comfortable 0,5-0,52l/km when doing long trips with sidebags/no passenger. Very happy with the bike now. As the consumption figure suggest, I don`t ride it very hard.

Edited by Muffinman
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