Modern Vespa

After re wiring part of look from 02 sensor I've given up ghost I've ordered a new complete wiring loom fed up of getting no where fast same out come lambda sensor fault took it to garage today to be told it's got to be a bad break in loom somewhere this mp3 has caused me money and pain just hoping it sort it out once and for all

Wouldn't it be a lot easier to just replace all of the wiring between the ECU and the sensor first?

If it fixes the problem, then at least you know it's not a duff connection inside the ECU.

I've already done that I repaired wiring over a month ago so I couldn't see any other way

I changed ecu a few weeks ago so I know it's not that I've had bike off road more than on it in last few months

So, to recap: You have replaced the ECU, the Lambda Sensor, and the wiring between the two, but a diagnostic readout still says "Lambda Sensor Fault".

A few years ago, I had a similar problem on a car I was working on. After the 3rd brand-new Lambda Sensor, I found that the dealer had supplied the wrong one each time - correct part number, same visual appearance and connector, different output voltage range.

I only discovered this after repairing a duff connector on the original.

Well halfway there took old loom out started fitting new one just. Real pain in arse lol just hope this sorts out my problems if not selling bike

Give you 50 quid for it !!!!

Keep at it mate you'll get there eventually.

Take my hat off to you for sticking with it.

Good time to do any additional mods while you have it down to tubing.
If this does not work, what's your Plan ?

Keith,
Marietta, GA

Did you measure the resistance with an ohm meter once you did your soldering to make sure you had a good connection?
Cold solder joint could act just like a resister.

Not happy chappy fitted loom to find out indicators didn't work or rear lights ☹️ Got back to supplier eBay ☹️ Said send it back so had buy yet another loom pissed off is a understatement if it don't work this time I'll sell bike as spares

Took bike to derby dealers yesterday to find all problems have been due to petrol pump I would highly recommend them as other garages have only rip me off I've spent over 500.00 pounds trying to sort problem out new lambda sensor wiring loom throttle body to be told today it's petrol pump it was only showing 1 bar and they run at 3 bars just shows to take it to a descent garage

This is why I test and don't just throw parts at them and see what sticks.

I bought parts as advised by dealer even tho they gave me wrong diagnostic information glad I found descent garage who know there stuff spent well over £900 but now I can go for a run and not worry about breaking down lol