AIR AMBIENT PRESSURE SENSOR
The PAI 350601 Air Ambient Pressure Sensor is a high-precision replacement part for Caterpillar engines (such as the 3126B). Designed to replace OEM references like 1946722 and 150-7673, this sensor ensures accurate ambient air pressure readings for the ECM. Available from Wofford Truck Parts, it offers robust construction, factory calibration and a 2-year warranty — helping optimize engine performance and emissions compliance.
$111.12
Specifications
Specifically designed for the Caterpillar 3126B engine family, the sensor features a 3-pin triangular connector, thread size 9/16″-18 and an overall length of approx 17.5″.
By providing the ECM with accurate ambient pressure data, this sensor supports proper air-fuel mixture, turbo-charger control, and emissions regulation. Worn or faulty ambient pressure sensors can lead to performance issues, reduced fuel economy or even engine derate. The PAI unit is factory tested, meets or exceeds OEM specifications and comes with a two-year unlimited-mileage warranty.
When installing, ensure the mounting location is clean, corrosion-free and that wiring is intact and properly sealed to prevent moisture ingress. Always verify that the engine prefix (3126B) and the sensor thread/connector match the original unit before ordering.
Compatibility
Freightliner Business Class (FL-Series) — 1991–2007
Freightliner Business Class M2 — 2003
International / Navistar (4700 / 4800 / 4900 / 9200 / 9400 / 9900 / ProStar — selected configs) — mid-1990s–2003
Buses, motorcoaches, transit and shuttle buses (various builders / chassis) — mid-1990s–2003
RV / motorhome chassis and specialty equipment (selected years) — mid-1990s–early-2000s
Other medium-duty and vocational trucks (various OEMs in markets where Cat 3126 was an option) — approx. 1995–2003.
Alternative Part Numbers
111-8125
150-7673
161-9925
1619925
194-6722
1946722