They have VIDA/DICE
They did change the front one first but the code came straight back, now they say the rear.
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Acording to there diagnostic machine, scanner, code reader call it what you like.
It said Bank 1, Sensor 1, (Sensor 1 Front) (Bank 1 Primary cylinders)
Do they understand the difference between Bank 1 and Bank 2, sensor 1 sensor 2? here below have a read
http://www.ngkpartfinder.co.uk/files/EOBD-coding.pdf
Tbh we have never had a issue with NGK sensor's they are Oe to most Premium Brands of vehicle, that's not to say they never fail, but its unsual for the lambda tobe directly at fault.
Hope the link above helps :)
Just to note have you tried to reset the ECU to factory default? perhaps the ecu didn't like the 1st pipe you fitted/items fitted, and is causing the voltage to fluctuate on the primary sensor (just a thought) im not ofay to me7 volvo's
on Vida Dice there is a set procedure too reset the codes and this procedure resets all the core values back to factory settings, it will not affect the remap in anyway, however if they havent reset it correctly it will come back straight away
No I didn't think it would reset the car to factory default, just thought if the code for the lambda was reset then no code would appear again unless the lambda was faulty. TBH my money is on the part of the engine loom the lambda connects to as it's been fiddled about with so much recently, there's a chance a wire could be brittle and have broken. Graham's is ME7 .
you could well be right as i have the same problem on mine, its a bloody pain as i need too lay my hands on a wiring diagram to find out which pin/s in the ecu corespond to which wires on the front lambda. Then i can check for power/continuity.
If i find anything Graham i will give you a shout but it will be a few weeks yet.
He who should not be named had a the same fault on he`s V70R.
Once resetting it would stay off of a while then come back on, It was found to be a knackered cat.
Is Graham`s new cat a Volvo one or a aftermarket one ??
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http://www.scribd.com/doc/28783687/volvo-c70-s70-v70
Dunno if this is what your after bud