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I just finished reinstalling the intake manifold after cleaning the valves and went to start the car. It starts for about 2 seconds before shutting itself down. It throws 6 pending codes. P0503 - Speed (RPM) sensor erratic/high, C0203, C1103, C1403, C1203, C1300. I don't think I did anything to mess with the speed sensor. Any ideas?

Edit:

startup video: https://www.dropbox.com/s/0cjn7k4ny480y70/A4%20Startup.mov?dl=0

Engine Stats right before shutdown: Engine Stats

OBD DTC: OBD Trouble Codes

UPDATE #2: So it turns out that my OBD reader was giving me the wrong codes. The real codes were P0351-354, all referring to the ignition coils (which I replaced at the same time). The car starts, registers the fault and then shuts down the injectors. They are the correct coils, and obviously they are getting current because the car starts.. why would it register those codes. I've reseated them checked all the connections. Unfortunately I didnt keep the old coils.

user2682863
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3 Answers3

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You can try replacing the Engine Crank Angle Sensor, which I believe is the one which is playing erratic. The sensor looks like this:

enter image description here

So it is the one you are looking at in the picture. Who knows why it's gone bad, but with the code you mentioned, this seems like the culprit.

This is a very good video on the replacement of the sensor. The only thing I'd say about what he does to replace it is, don't mess with the throttle while trying to crank your engine. On many (not sure about the VAG engines), your throttle position sensor will get screwy readings when you do that and your car won't run right again until you do a reset.

Overall, this is a very easy thing to do. You may even be able to do the exchange from the top side (instead of removing the cover).

Pᴀᴜʟsᴛᴇʀ2
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All your codes are from different areas but can be from the same place. It's ABS, Brakes, Axle solenoids and so on.

I suppose you or your mechanics forgot to connect one of big connectors with several wires that are causing your problems. Try to look for unplugged connectors under your trunk

Good luck!

Dzianis Yafimau
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Is the ABS/ESP control unit located in the vicinity of the intake manifold? Did you try removing the connector of ABS/ESP control unit?Check whether the ABS/ESP control unit is communicating with the scanner. All the fault codes point to issue in ABS/ESP control unit

knocksAndMisfires
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