Please could you help? I have a yamaha wr125r 2010 and have just bought a leo vince exhaust without a lambda o2 sensor connection will it be ok to remove the sensor alltogether.

p0131 is a lambda sensor fault bank 1 or could just be a exhaust leak you should go to a good reliable mechanic for help

the chip in your ECU needs to be updated as it controls the fuel and air mix so you have more air from your exhaust ,contact the dealer for more information.

I know this may sound rather stupid but my father has bought a brand new bike and he only intend to use it on our farm. Now the trouble is that neighbours complaint about the noise from the bike and we have asked the dealer if it was possible to get a more quieter exhaust, but he just said that you only were able to get exhausts that increase noise. So what we need is a exhaust which is less noisy (The standard one is direct flow, or what you call it) and one that doesn't sacrifice too much of the power. You can hear it miles away I love it, but my father tells me to only put a maximum of half throttle when I ride it, which is a little boring Can you help me ? , As for a quieter exhaust for your bike, your dealer wasn't very knowledgeable on the subject. While most aftermarket exhausts do increase noise, there are some to help decrease as well, without saraficing power. I can think of a couple over here in the US, but I'm not sure if you get many distributors for our stuff over there. There's also a European exhaust manufacturer that comes to mind, which is Leo Vince. And four-stroke exhausts aren't exactly cheap. Some ones that you could look into are: -FMF Powercore IV Q2 (around 96db) *slip-on* -Pro Circuit Type 496 (I'm not sure around what db level this is, but I know that the body is longer and it uses a special packing to help reduce noise) *slip-on* -Leo Vince X3 (every leo vince exhaust includes inserts for 99 and 96db, and also a spark arrestor) *full exhaust*,,,