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Old 06-12-2013, 09:16 PM   #1
Sauer 1979 OP
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GS 911 Fault code help needed!

Hi all,

I ran the GS 911 over a friends R1150 GS 2003 model bike.

He wad complaining about the surging of the bike at 2000 - 3000 rpm.

The error code is as follows.

304: Oxygen (Lambda) Sensor Circuit Malfunction, Signal implausible.
This fault occured 57 times.
The fault is not present now.
4400: Lambda-Control, Upper control limit reached
This fault occured 60 times.
The fault is not present now.
Has anyone had any experience with this?

What should we look for?

It looks to me as we might need a new oxygen sensor.

Any help would be great!

Sauer 1979 screwed with this post 06-12-2013 at 09:16 PM Reason: Colour change!
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Old 06-13-2013, 03:17 AM   #2
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Pretty simple - The lambda probe isn't functioning correctly. Replace said item.
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Old 06-13-2013, 04:04 AM   #3
roger 04 rt
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Could be as simple as it is a bad sensor.

Connect your GS-911, get the bike fullymwarmed up and then read the realtime values. Idle the bike. It should indicate that lambda control is: On. Then plot O2. If the plot looks something like these http://www.hexcode.co.za/techinfo/lambda then these then your o2 sensor is functioning at least part of the time. If not the sensor may be dead.

It could also be that you have leaking hoses in the tank and at higher powers the lambda control reaches its max and can't add enough fuel to get to lambda=1, which is the error.
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Old 06-13-2013, 11:44 AM   #4
Cogswell
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Surging...Have him install a set of Autolite 3923 spark plugs and clear the stored codes. Disconnect the battery-1 min-reconnect the battery and re-learn the TPS by fully opening and closing the throttle several times with the engine off. Cycle key again and take the bike for a ride.


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Old 06-13-2013, 06:23 PM   #5
BluByU
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Yep Steptoe is on the money, Replace the O2 and pull the ECU fuse to reset the fuel trim after the O2 has been replaced.
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Old 06-13-2013, 08:21 PM   #6
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Thanks to everyone that have replyed.

I will let you know the outcome!
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Old 06-14-2013, 02:17 PM   #7
Bigdog54
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At the risk of great online ridicule.....what the heck is a Lambda Probe? And where the heck is it?
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Old 06-14-2013, 02:39 PM   #8
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Quote:
Originally Posted by Bigdog54 View Post
At the risk of great online ridicule.....what the heck is a Lambda Probe? And where the heck is it?
Google is your friend................
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Old 06-15-2013, 10:04 AM   #9
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Quote:
Originally Posted by Bigdog54 View Post
At the risk of great online ridicule.....what the heck is a Lambda Probe? And where the heck is it?
It's the fancy name for an oxygen sensor (O2 sensor).
It's screwed into your exhaust pipe somewhere between the heads and the catalytic converter.
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