kbo21

Wow! Awesome!!! I ran accross this website during my research but I didn't check how it worked. I might give it a try next time!

By the way @Wino, could you tell me where/how to find this kind of info?

Hi! So, no more problems after replacing the canister purge valve! I had a hard time passing all the emissions tests (the readiness statuses in vcds). Actually all statuses passed after 1 or 2 drive cycles except the Catalytic converter. After 100km+ and 5+ drive cycles it was still "Failed or incomplete". Eventually had to get its temperature up to 430°C and perform the basic setting to get it "passed". Anyway thanks for your help @Wino @sepulchrave

I forgot: I also tried actuating my valve by applying GND to pin 1 and +12V to pin 2 and I couldn't hear any clicking sound, so that's what made me think the valve is faulty (unless i applied the wrong polarity?)

Hi guys, so my situation evolved a little bit. First, I got a DTC while doing some tests with the EGR valve plugged: 17519 - Oxygen (Lambda) Sensor Regulation: Bank 1: System too Lean P1111 - 35-00 - - I researched a lot about that and it seemed to confirm the vacuum leak theory. "Unfortunately" I don't smoke and don't have any close friend who smokes either so I couldn't do the test you said @sepulchrave Anyway, a few days ago, I plugged the EGR valve, performed the EGR basic settings with vcds, then I tried starting the engine but it stalled right away. I tried a second time and gave some gas about 3000rpm and this time the idle went perfectly stable! I then got the following DTC: 16825 - EVAP Emission Control Sys: Incorrect Flow P0441 - 35-00 - - So now, I think that the vacuum leak must have come through my canister purge valve N80 (for which I had an intermittent defect once before) that must've remained stuck open. My car has been running fine with the EGR valve plugged since that day. I ordered a replacement valve and it should arrive tomorrow. Hope it will be the end of my problems. I noticed something weird though, here is a photo of the canister purge valve connector on my polo. I measured the voltage while performing the output test of the valve with vcds, turns out it was -10V between the black/blue and red/purple wires. I thought red was the +12V and blue the GND? The valve is from Bosch, ref. of the valve is 0 218 142 345.

It makes sense... I read another thread on a french forum where the guy tried an interresting experiment after facing a similar issue. So, he first replaced his egr valve while investigating on another problem, then noticed that he had stalling issues at idle when the new valve was plugged. He then tried connecting the old valve (unmounted) while leaving the new valve mounted and disconnected. Well, the issue was the same. So maybe the ECU does use a more robust control alorithm when no valve is found.

Hi Wino, thanks for the tip! I did check the servo hose when this problem started (early 2019...) although not very thoroughly. I can't see how it would lead to such symptoms though. I mean, wouldn't it affect idle even without EGR ? I will check again tonight just to be sure. Also what the OP didn't mention is whether he did the basic settings of the EGR valve and throttle after disconnecting/changing them.

Hello guys, sorry to dig up this old thread but I have exactly the same issue with my Polo 9N, which also has the same BKY engine. I've been driving with my egr valve unplugged since I found out that unplugging it cured the unstable idle/stalling (it does stall inevitably). Damiansheffield if you can hear me.. Did you eventually find a solution? Note: I have vcds lite in case anyone else wants to help me out