hi martin thanks for that it makes sense really as ive read above P0135 will set P0141 and thought about that before .
id be best buying them one at a time really . Ive checked the fuses had a good luck at the wireing to check for melting on exhaust etc unpluged both sensors checked conections everything looks fine so far .
any idea if i should have any voltage on the white wires or is the plug only in use on cold startup ?