Fault Code Help (Wiring or Mass sensor fail)

Hi Guys.

Over the past week or so the VS has been feeling a bit down on power (not hugely noticeable but enough to bug me)

Ran an error code check and got:

Code 15 - Coolant temperature Sensor high voltage

Code 22 - Throttle Position Sensor (TPS) low voltage

Code 23 - Air Temp Sensor high voltage

Code 32 - Manifold Air Flow Sensor

It seems strange that all these errors appeared at once.

I check the codes every few weeks to make sure all is well so its not something that has gradually been getting worse.

The only thing I have done to the car of late is regas the compressor but thats about it.


Could this be a wiring harness/ECU issue as I highly doubt all the sensors would have gone at once?

Where should I start with this?

I have reset the ECU and the codes are still coming up.

Thanks

 

Update: Just checked some of the wiring/plugs for some of the sensors with the multimeter with the ignition on.

MAF: 12.1V between Right To Middle Pin, 5V between Left to Middle Pin

Air Temp Sensor: 5V

Coolant Temp Sensor: 5V

Does that look right?

Took the engine for a run round the block (about 1.5km) and the engine bay is ridiculously hot (can't touch the top of the plenum)...which seems quite hot for such a short trip from cold stat. (temp gauge didn't seem to go over a quarter though)