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@shebalba avatar
UTC

Molto Verboso
2009 GTS250, Ducati Monster M900, KTM 390 Adventure, Honda CR125
Joined: UTC
Posts: 1514
Location: Oceanside, CA
 
Molto Verboso
@shebalba avatar
2009 GTS250, Ducati Monster M900, KTM 390 Adventure, Honda CR125
Joined: UTC
Posts: 1514
Location: Oceanside, CA
UTC quote
I am replacing the cracked exhaust manifold on my GTS250. I unplugged the Lambda sensor and as carefully as possible removed it from the broken pipe.

Some of the soot on the cylindrical portion, just above the threads was disturbed from handling.

If the sensor was functioning properly before removal, do I just install it into the new manifold and hook everything back up, or is now the time to replace as a best practice?

Ive also read they sometimes do not appreciate being removed.

The bike has about 15K on the clock and I believe a sensor went bad around 6K and this is the replacement.

Photo of said sensor.

Thanks in advance!
Forum member supplied image with no explanatory text
@burt37 avatar
UTC

Addicted
GTS 300 SS BB
Joined: UTC
Posts: 617
Location: QLD AUS
 
Addicted
@burt37 avatar
GTS 300 SS BB
Joined: UTC
Posts: 617
Location: QLD AUS
UTC quote
Re: Lambda Sensor: Replace or Regret?
Shebalba wrote:
I am replacing the cracked exhaust manifold on my GTS250. I unplugged the Lambda sensor and as carefully as possible removed it from the broken pipe.

Some of the soot on the cylindrical portion, just above the threads was disturbed from handling.

If the sensor was functioning properly before removal, do I just install it into the new manifold and hook everything back up, or is now the time to replace as a best practice?

Ive also read they sometimes do not appreciate being removed.

The bike has about 15K on the clock and I believe a sensor went bad around 6K and this is the replacement.

Photo of said sensor.

Thanks in advance!
Just reinstall it, and you will be just fine.. We only replace them when they fail, (not that often to be honest)

Remember the golden rule: If ain't broken don't fix it! 8)
@juan_orhea avatar
UTC

Molto Verboso
S150 '09, Beo 500ie '08
Joined: UTC
Posts: 1233
Location: Bermuda
 
Molto Verboso
@juan_orhea avatar
S150 '09, Beo 500ie '08
Joined: UTC
Posts: 1233
Location: Bermuda
UTC quote
It's also not too difficult to replace - so why not wait until it fails.
⬆️    About 6 months elapsed    ⬇️
@littlejimmydickens avatar
UTC

Enthusiast
GTS 300
Joined: UTC
Posts: 56
Location: Chillicothe Ohio
 
Enthusiast
@littlejimmydickens avatar
GTS 300
Joined: UTC
Posts: 56
Location: Chillicothe Ohio
UTC quote
How do you know when it fails? Can it be bad and not cause a check engine light?
@jess avatar
UTC

Petty Tyrant
0:7 And counting
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Posts: 37193
Location: Bay Area, California
 
Petty Tyrant
@jess avatar
0:7 And counting
Joined: UTC
Posts: 37193
Location: Bay Area, California
UTC quote
IMHO, if it's not triggering the Check Engine light, it doesn't need to be replaced.

(Okay, I once melted the connector on one when I forgot to plug it back in after reinstalling the exhaust -- but I zip-tied the connectors together and it continued to work for years afterwards).
UTC

Ossessionato
2016 Vespa GTS300ie abs/asr/ess Settantesimo '70'
Joined: UTC
Posts: 3766
Location: East Anglia, UK
 
Ossessionato
2016 Vespa GTS300ie abs/asr/ess Settantesimo '70'
Joined: UTC
Posts: 3766
Location: East Anglia, UK
UTC quote
Lambda sensors last a very long time. Typically by mileage on the GTS you can be looking at an average 50-60k miles or more. Although I've known them to continue functioning for 70-80.000 miles on bikes that we looked after. Manufacturers will tell you 40k is the typical lifetime limit. This is due to the erosion of the lambda tip, and or the failure of the heating elements on 4 wire systems. If you ride WOT they wear out more quickly.

Ultimately, it's a variable thing but yours should be fine for many more miles yet!
@attila avatar
UTC

Veni, Vidi, Posti
In garage: Yamaha Tricity 155 Urban 2019 - MV Agusta 125 RS 1956
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Posts: 8291
Location: Latina (Italy)
 
Veni, Vidi, Posti
@attila avatar
In garage: Yamaha Tricity 155 Urban 2019 - MV Agusta 125 RS 1956
Joined: UTC
Posts: 8291
Location: Latina (Italy)
UTC quote
Bypass it and break the warning light, also reprogram the ECU to not notice the operation of the probe ..?
@vintage_red_matthew avatar
UTC

MV Santa
GTS250, 1975 VBC, 1980 P200E cutdown
Joined: UTC
Posts: 4767
Location: Sedgwick, Kansas
 
MV Santa
@vintage_red_matthew avatar
GTS250, 1975 VBC, 1980 P200E cutdown
Joined: UTC
Posts: 4767
Location: Sedgwick, Kansas
UTC quote
jess wrote:
IMHO, if it's not triggering the Check Engine light, it doesn't need to be replaced.

(Okay, I once melted the connector on one when I forgot to plug it back in after reinstalling the exhaust -- but I zip-tied the connectors together and it continued to work for years afterwards).
My check engine light is on and I suspect the lambda sensor. Is there a way to test it to be sure?

2006 GTS with 40k miles on it.
@jess avatar
UTC

Petty Tyrant
0:7 And counting
Joined: UTC
Posts: 37193
Location: Bay Area, California
 
Petty Tyrant
@jess avatar
0:7 And counting
Joined: UTC
Posts: 37193
Location: Bay Area, California
UTC quote
vintage red matthew wrote:
My check engine light is on and I suspect the lambda sensor. Is there a way to test it to be sure?

2006 GTS with 40k miles on it.
You'd need a diagnostic tool to read the code. Shade-tree technique is just to swap it with a known-good one and see if the problem goes away, then you know.
UTC

Ossessionato
2016 Vespa GTS300ie abs/asr/ess Settantesimo '70'
Joined: UTC
Posts: 3766
Location: East Anglia, UK
 
Ossessionato
2016 Vespa GTS300ie abs/asr/ess Settantesimo '70'
Joined: UTC
Posts: 3766
Location: East Anglia, UK
UTC quote
You can test the lambda with a multimeter. Full test specs for impedance listed in the free workshop manual in this site's Wiki.
UTC

Ossessionato
2016 Vespa GTS300ie abs/asr/ess Settantesimo '70'
Joined: UTC
Posts: 3766
Location: East Anglia, UK
 
Ossessionato
2016 Vespa GTS300ie abs/asr/ess Settantesimo '70'
Joined: UTC
Posts: 3766
Location: East Anglia, UK
UTC quote
Attila wrote:
Bypass it and break the warning light, also reprogram the ECU to not notice the operation of the probe ..?
Yes, you can do that but you need tech & know how to do it. It's also not the best idea & will affect the fuel economy, emissions & the performance. Trust me I've done it on numerous engines for experimental purposes (when developing engines) to problem solve.
@attila avatar
UTC

Veni, Vidi, Posti
In garage: Yamaha Tricity 155 Urban 2019 - MV Agusta 125 RS 1956
Joined: UTC
Posts: 8291
Location: Latina (Italy)
 
Veni, Vidi, Posti
@attila avatar
In garage: Yamaha Tricity 155 Urban 2019 - MV Agusta 125 RS 1956
Joined: UTC
Posts: 8291
Location: Latina (Italy)
UTC quote
Stromrider wrote:
Yes, you can do that but you need tech & know how to do it. It's also not the best idea & will affect the fuel economy, emissions & the performance. Trust me I've done it on numerous engines for experimental purposes (when developing engines) to problem solve.
Here in Italy it is done on some diesel cars (not all) with the particulate filter, they exclude the probe and bypass the filter.
The aim is less maintenance and an increase in power. Obviously it is illegal and if you are discovered there are high fines and even the seizure of the car, moreover in the event of a road accident the car is considered unsuitable for circulation on the road.
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