After my last oil & air filter change the CEL comes on with P1143 Pressure Sensor Circuit Low Input. What Pressure Sensor is it talking about??

 

Charley

I think this sensor is located on the pass side strut tower. A couple of vac hoses are connected to it IIRC.

Maybe they knocked off one of those hoses when replacing the air filter.

Thanks for the reply. I had to put it off for a couple of months. CV shafts had to be replaced and work picked up. I have isolated the code to the device you mentioned. After trying several changes and watching for new codes. It appears the device is stuck open. I've even applied 12vdc to the solenoid post but no change in the amount of vacuum that is able to pass thru it. After all that is said what is the part name or number for the dealership? I could just take the part off the car and show it to them, but I look rather "duh" to them anyway so why remove all doubt.

 

Thanks,

 

Charley

 

 

I think this sensor is located on the pass side strut tower. A couple of vac hoses are connected to it IIRC.

Maybe they knocked off one of those hoses when replacing the air filter.

If i am correct, this used to be called a manifold absolute pressure sensor. Its a dual purpose sensor. It flips between manifold pressure and atmospheric pressure. It will affect perforamnce espeically in elevation changes. The solenoid you speak of being stuck means the car is not sensing manifold vaccume.

This may be a pricey item at the dealer, but cheaper at a junkyard.

 

 

nipper

I did get a manifold absolute pressure sensor failed code when I unpluged the solenoid. A couple of online part stores list it for $55 - $58. Ice storm today so I'll wait until it clears and dries up before I go junk yard hunting. Thanks for the info (nipper)

 

Charley

MAP sensor for ~50 bucks! I've got a '99 OBW and the dealer wanted close to $300! Even about $200 from internet subie parts places. I can't remember what year your car was, but if you can get them for 50 bucks new, why bother hoping that the junk yard one still works?

damn thats a great price, make sure its the right part ...

 

 

nipper

The defective sensor was the one in front of the passenger side shock. My 97 MAP is inline with the air filter / intake. Local junk yard $25 + tax and a 10 day guarantee. The used part cleared the code and the car does seem to have more power.

 

I didn't mean to imply that I could get a MAP sensor for $50, sorry.

 

Frag & Nipper thanks for the help you sent me in the right direction. The solenoid is in line with the barometric pressure sensor.