Ignore codes-ecm-4490 and-44B0 at your peril

[sv70]

I had these codes for a couple of months on my-06 year- V70 D5 euro4,read with an icarsoft, relating to the egr position sensor signal too high and also-faulty signal, anyway as the car was running fine i just deleted the code time after time, a few weeks ago i was going uphill-engine service required light came on and power dropped right off, pulled up at a layby and it cut out and wouldn't restart at all had to call out the breakdown, first time in nearly 5 years it let me down or i should say I let it down by not attending to the fault code when i first saw it.I had a known good spare egr valve with cooler off an auto model, but the auto doesn't have the vacuum can on the cooler so put my cooler on [gasket-8699210 required].On separating the cooler from the egr body i could see that the plunger was stuck in the open position ,letting gases in the inlet from standstill ,but on the good egr that plunger was shut, swapped it all over using a new V clamp-[part-30640843] Oh also changed the exhaust temp sensor-[part-31370463] next to the lambda sensor because that was another code i didn't address, anyway that sorted the problem, it's running the best it ever has,-lesson learnt and i've slapped my own wrists before someone else does.