Spotted this one flagged up in VCDS and I've been meaning to look into it, as the AC isn't running cold at the moment.

00819 - High Pressure Sensor (G65)

009 - Open or Short to Ground

Does this point to the refrigerant level being too low? Ross-Tech wiki just seems to point to checking the wiring and connections to the sensor.

Any measuring blocks I can check with VCDS, that will give me a bit more info? Just wondering whether it's just a re-gas I need, or whether I need to consider a fault with the sensor, or the wiring to it.

Cheers,

Steve.

Anyone?

It's the wiring, the connector to the sensor or the sensor itself.

Changing lots of switches at the moment for this fault and they also leak. But I'd check the wiring as it's quite close to the fan and can rub through.

Thanks. Can the sensor be changed on its own, or is it part of the larger AC system?

Sensor can be changed on its own.

You can check that the sensor has power on pins 1 and 3 of the connector.

Cheers for the info. Is the sensor easy to access?

Hi Steve,

Not sure if it helps, as the others have pointed you in another direction, but may be useful as an FYI ... if the refrigerant gets low, it will log "00229 - Refrigerant Pressure: Lower Limit Exceeded" (or rather, it did on my parents' Octy )

First of all you can't replace the sensor yourself as the refrigerant needs to be recovered first.

The sensor is located on the hose flange connector for the condenser output. It's not too difficult to get the connector off the sensor.

Make sure you keep your hands away from the fans!

OK guys thanks - that's helpful.

Will leave this one to an HVAC specialist then

Changing lots of switches at the moment for this fault and they also leak. But I'd check the wiring as it's quite close to the fan and can rub through.

Cheers Ross

Is the wiring quite easy to get to and visually check?

No to bad for a quick look, the switch is down the left hand side at the front in the engine bay, not far from the compressor.

just want to bring this thread back up ive got the g65 high pressure sensor fault. but i also have the 00229 refrigerant preasure lower limit exceeded could the lack of gas have caused the g65 fault

Mine was sorted with a regas and the issue didn't reappear.

Just to point out that if the high pressure switch/sensor needs changing then a gas recovery and regas is not necessary. There is a Schrader type valve under the switch that keeps the gas in when changing the switch/sensor 

On 09/08/2011 at 13:08, rwbaldwin said:

Sensor can be changed on its own.

You can check that the sensor has power on pins 1 and 3 of the connector.

Any idea what voltage should be on these? I get 12/14v on one pin and 0/0.055v on the other (off/running).

No obvious damage to the wiring but both should be 12V I'll know roughly where to look.

What you've measured is correct.

Thanks, it will be the sensor then.