lambda sensor problem

[dan1983]

Hi just wondering if this has happened to anyone else, bought my car few years ago and did the air box mod, as soon as i did this the emissions light came on, i just ignored it until about 2 months ago when i wanted to sell the car, i had the fault code read and it came up with lambda sensor, so i changed the first one, light still came on, then i changed the second one but when i ordered the second one from ebay with the same part number it came with a shorter lead but wire colours matched up so i cut the old coneector and used that to make it longer, but light is still on, and fault code is still lambda sensor bank 2.
Anyone got any ideas as i really need to sell the car.

[dan1983]

oh by the way the car is the 2.0t edition 100

[Ste]

You don't have a bank 2.


Are you sure it's not bank one sensor 2?

[dan1983]

yeah sorry it is

[Ste]

What fault code did you get?

The second O2 sensor is to check if the catalyst is working.

[Big Sig]

It could be the maf putting in too much air so the lambada sensor shows a fault with the emissions being wrong, you need to read inbetween the lines when fault finding.

[dan1983]

Hi big sig, sorry i dont understand, when i did the air box mod i took the mass sensor plug out, to do the mod, put it all back and thats when it started, since then i have unplugged it and plugged it back in but nothing

[Big Sig]

I am saying that it may not be the lambada sensor thats wrong, it could be doing its job as its seeing the wrong emmisions due to a fault somewhere else, maybe the maf or an air leak somewhere.

[dan1983]

hi what does the maf do and are they expensive , it sounds like it could be the maf as it happened straight after doing the air box mod, which allows more air in. the fault code is P0140.

[Big Sig]

MAF= mass air flow. You said you unplugged it, is it back in correctly?