This can be a sign you are getting low on refrigerant.
There may be a pressure sensor on the low pressure side of the system that is detecting that the pressure is dropping too low. This turns off the compressor. When the pressure raises again, the compressor Is turned back on and the cycle repeats.
P0500 on the H6 engine is, as you say, a Vehicle Speed Sensor. Check your ABS sensors on each of the front wheels.
Here's the usual cause for a P0500 error;
Check the ABS tone wheel on each front wheel, plus the connector wiring to it. The sensors themselves are usually pretty reliable unless they're damaged by removing the hub.
You may need someone with access to the Subaru Select equipment to get this resolved.
The service manual states for the ATF light blinking 8 times in 2 seconds.
Step 4 - CHECK TCM.
Read the data of «ATF Temperature Lamp» using the
Subaru Select Monitor.
Is “ON” displayed?
If yes, Go to step 5, else Perform the self diagnosis of combination ...
I'm not seeing any issues here ... at all. It looks absolutely immaculate considering it is going on eight years old. Remember, no gasket or seal does its job completely. You might get a little bit of seepage from them, especially after they get a little bit old. Head gaskets, as long as you don't overheat the engine or disturb the seal will continue to do ...
Sealant won't fix your issues. It will continue to blow out the reservoir. Sealant rarely if ever will fix a head gasket issue. It might, plug up the radiator if there is a small hole in it, but I still wouldn't trust it to do this. All the sealant will successfully do is plug up the coolant passages in the engine. Pressures inside the cylinder during the ...
You can find the factory service manual specific to your Subaru vehicle including trouble shooting error codes and wiring diagrams over
This manual describes P0500 on page 2958 as related to either the ABS warning light OR a wiring problem, I've pasted the section below.
For part and loom ...