P2146 Open Circuit w/ P0201 and P0206 Intermittent

[KobyBryant]

Hey guys,

I have a 2013 S7 sitting at 95k miles. Been lurking for quite a while. Hate that my first post is an issue. Nonetheless, I've been chasing a P2146 and have pretty much given up since I couldn't find much info.

After a spark plug swap, I came across many issues that I eventually fixed. Most came from putting connectors back incorrectly.

Once, I finally finished everything, I took the car for a test drive. She ran fine on the drive until I realized that I didn't have the coolant reservoir properly sealed and it was spraying everywhere.

I went to the Audi dealership to buy a new reservoir clip and got a P2146 open circuit code with misfiring.

I would like to also add that I was running DS1 OTS 93 which was causing mild misfiring but would go away with an engine restart. That is what initially prompted me to change the spark plugs.

Could something be shorted out from the coolant spraying everywhere? Is it possible that a connector is not seated properly?

Any advice helps.

Thanks!

[KFT2]

Have you rechecked the fuel injector connectors for cylinder 1 and 6? If this only happened after unplugging them to change the spark plugs it seems likely that they are not fully seated back in.

[Burkeomatic]

Yeesh man.

So you have a misfire. Think oldschool. While these are complex engines, it still comes back to the basics.

You need 4 things for a successful combustion event, fuel, spark, air, and compression.

Start with the simple/cheap things. Make sure you're coils and whatever you removed are seated well, and you didn't jar anything loose. - Free
Did you run a VCDS scan? I'm not privy to what "group a" injector bank is, but I'd be willing to bet you bonked something.

1 and 6 are on different banks, it would be hard to imagine that you caused an over heating incident and damaged those two. Did you over heat the car?

If you have an air compressor, you could do a leak down test or borescope your cylinders (which involves redoing work, which may or may not be a blessing)

Are your plugs gapped right? Is there any way you gapped them and accidentally closed the gap on a couple by being a little ham fisted? I've accidentally shortened the gap on a plug by dropping it down a cylinder well and pressing on it when it wasn't lined up. A stupid mistake on my part (and reason to invest in a proper plug socket) but I chased my tail on that forever and thought I had blown my engine because I was an idiot. No way it could have been my plugs I said. I just did those and knew it was right. I noticed it right when I took the plugs out to do a compression test and thought "dang, I'm stupid."