2.0 Tdi throttle position sensor and EML

Hi all

Bit of advice if possible please: Had an EML come on: no loss of power or anything obvious: got the fault codes read, and apart from No4 Glow Plug open circuit, I had P021000-Throttle valve position sensor, implausible signal. Having read another article on here, I ventured under the bonnet, stripped out the throttle valve assembly and cleaned out a heap of carbon/ soot and a bit of oil debris. Put it all back together, which was easy enough apart from wrestling the flexible hose from the intercooler pipe back into position....

The car pulls better and is noticeably smoother. The engine management light (unsurprisingly, as I haven't got a reader capable of interrogating the Yeti's ECU to clear the faults) stayed illuminated. Two days later, I started the car and the EML has gone out and stayed out. Is this something that happens after a couple of hot / cold cycles - assuming the fault has bee cleared? I'm curious.