The sensor was wired this way when I got the car it's a 2008 hhr ss. My question is there anyone who can tell me if it's correct. I've had a ton of map codes and issues with my boot gauge going nuts and the car not running as it should. I have the green wire connected first white wire second the third port is not connected and the last one is the red wire. Shouldn't the red wire be in the third port and the fourth one me a dead wire? It's the 3 bar sensor.

 

That's correct, albeit sketchy. If at all possible, I would put pins on the original wires so they go directly to the connector, instead of having an additional connection that could potentially cause issues.

Like this


You should check the TMAP wiring as well, which should be as follows:

1 - Gray
2 - Light Blue
3 - Tan
4 - Purple

What you're calling the third port is actually pin 2 (temperature output) and is only used on the TMAP (lower sensor on the cold side charge pipe).

 

Have the sensors been rescaled correctly in the tune and have you replaced both map sensors?

 

The lower sensor hasn't been replaced I replaced the top one numerous times thinking the sensors were shot. The car was recently tuned then I got codes for low circuit a little while after. I checked the green wire and it was disconnected completely. After I read connected the wire I get codes for high circuit and it boosts 27 psi when it was tuned it maxed at 24