Last edited by Blasirl; 09-28-2018 at 03:01 PM.
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The P0171 is a severe vacuum leak, the following codes are telling you they don't have enough adjustability to cover for it.
In this example, the P015B is not a bad sensor....it is a sensor saying it is calling for a richer mixture (due to the vacuum leak) and it is not getting the result it is calling for.
The P01101 is the sensor seeing a air source entering the engine after the mass air flow sensor.
The most common cause of the primary code on this 1.4t (P0171) is the burst valve (often called PCV) located on top of and part of the cam cover. Usually you can hear it whistling under the spark plug cover. If you remove the plug cover you will see a disc looking cap molded on top of the cam cover and will note a relief hole pointing mostly forward. Put your finger tip over the hole to stop the vacuum leak.
The engine will immediately smooth out if the disc has fractured internally.
This means, at very least, the cam cover will require replacement but often the disc has failed as a result of a plastic check valve that is part of the intake manifold, failing......usually injested by the engine (speculation....we don't know where it really goes heh heh).
Search around or hopefully another member can give you a link to a few photos.....you will be looking down a port in the manifold once a vacuun tube is removed.
If the valve cannot be seen, a manifold is required or else, the vacuum discwill have a rather short lifespan. Without the check valve the disc is subject to constant high vacuum loads.
Odds are the sensor you replaced was doing its job.
I know what you are talking about. I saw it in another video and there is a guy who sells a work around https://www.youtube.com/watch?v=En4WO7DYsTk. I have looked down that tube and can't see the orange valve that is supposed to be there. I figured that I replaced a perfectly good sensor last night when I saw these videos. Not a cheap fix. Do you or anyone else have the torque values for the valve cover and the intake manifold?
I do not have specs. but all are in inch lb. Very low settings for plastic parts.
I am told by the gang at the dealer I hang out at the the newest generation manifold has far more robust retention of the valve. I guess GM ( Chevrolet and Buick) got tired of buying manifolds for a two bit check valve.
Thanks for getting Rob to post on here. He confirmed what I thought I had to do. Parts are ordered.