Hi!

I drive mostly dual carriageway to work, 40 km one way. I get this P0101 when I approach a roundabout (i.e. when I have to slow down) while driving at constant speed. The first time this came up was a couple months ago when I threw in a bottle of cleaner with a full tank, I drove on the 4th gear at high revs close to 3.5k for around half an hour. And since it has been coming up every single day. I don't feel any difference in the drive.

I have replaced the MAF, got one from the breakers. No luck.

What could it be? My MAF readings are always in range and as should be.

It's a 2010 diesel mk2 1.6.

Thanks!

Edited 22 February22 Feb by symptomchinchillas
Added car info

Possibly an indirect effect of EGR malfunction.

I believe @mac11irl has experienced something like this.

49 minutes ago, Breezy_Pete said:

Possibly an indirect effect of EGR malfunction.

I believe @mac11irl has experienced something like this.

Yup!

Exact same early days symptoms of a sticking egr

5 hours ago, mac11irl said:

Yup!

Exact same early days symptoms of a sticking egr

Will cleaning the valves do it? I was hesitant to touch it since it's in the most inaccessible place.

8 hours ago, symptomchinchillas said:

Will cleaning the valves do it? I was hesitant to touch it since it's in the most inaccessible place.

You can try and it might work. It depends on if it’s just gummed up or mechanically just failing. But essentially it’s sticking open so your getting more “air” in the chamber than the maf is metering in when you lift off after a long consistent run. So the ECU thinks it’s a maf problem.

If you search my username and egr you’ll find my symptom development guide I did up. In the end I had mine blanked off and mapped out for 20% the cost replacing.

4 hours ago, mac11irl said:

You can try and it might work. It depends on if it’s just gummed up or mechanically just failing. But essentially it’s sticking open so your getting more “air” in the chamber than the maf is metering in when you lift off after a long consistent run. So the ECU thinks it’s a maf problem.

If you search my username and egr you’ll find my symptom development guide I did up. In the end I had mine blanked off and mapped out for 20% the cost replacing.

Thanks man! I will check it out.

So I have the EGR deleted today. Did a test driven on the dual carriageway. Nothing popped up. I'll check again tomorrow on way to work.

What way was it deleted?

So I got the ECU mapped leaving the valve off, intake flap off as well and not sure why did the lad turned off the P0101.

Edited 24 February24 Feb by symptomchinchillas