car code po240


Asked by tomtaz708 Mar 06, 2013 at 05:58 AM about the 2000 Mercury Cougar 2 Dr V6 Hatchback

Question type: Maintenance & Repair

3 Answers


P0240 - Turbocharger/Supercharger Boost Sensor 'B' Circuit Range/Performance -- This diagnostic trouble code (DTC) P0240 will set if the boost pressure sensor signal is above the predicted range. -- The boost pressure sensor responds to pressure changes in the intake manifold. This pressure is created by the turbocharger and changes with accelerator pedal position (APP) and engine speed. The engine control module (ECM) uses this information to assist in diagnosis of the barometric pressure (BARO) sensor and to provide engine overboost protection. The boost pressure sensor has a 5-volt reference circuit, a low reference circuit, and a signal circuit. The engine control module (ECM) supplies 5 volts to the boost pressure sensor on the 5-volt reference 2 circuit, and provides a ground on a low reference circuit. The boost pressure sensor provides a signal to the ECM on a signal circuit relative to the pressure changes. The ECM monitors the boost pressure sensor signal for voltage outside of the normal range. The ECM calculates a predicted value for the boost pressure sensor. The ECM then compares the predicted value to the actual signal.


Possible causes: Boost pressure sensor harness is open or shorted - Boost pressure sensor circuit poor electrical connection - Faulty boost pressure sensor - Faulty Turbo/Super Charger - Engine over temperature - Ignition misfire exceeds the calibrated threshold - Faulty Knock sensor (KS)


Hello tenspeed I am still having problems finding code p0240. The ford service tech states p0234 as a supercharger boost condition which I believe do not have and po243 supercharger boost bypass solenoid circuit malfunction but no p0240.

Your Answer

Add photo

Related Questions

  • check engine lite comes on with code po240

    under long inclines with heavy to moderate acceleration the lite comes on code po240. there are no performance issues. replaced catalytic converter and front o2senser.

    2005 Chevrolet Malibu Base


    Maintenance & Repair

  • engene light on

    le puse la computadora y tiene 3 codigo po135 po240 y po496 nesecito saber que puedo hacer para resolver el problema satrun astra 2008 xe

    2008 Saturn Astra XE


    Maintenance & Repair

Looking for a Used Cougar in your area?
CarGurus has 274 nationwide Cougar listings and the tools to find you a great deal.

Search Mercury Cougar Questions

Mercury Cougar Experts

#1 lisagayle
Reputation 1,800
#2 Tom Demyan
Tom Demyan
Reputation 500
#3 Jessica Cornelison
Jessica Cornelison
Reputation 450
View All

Related Models For Sale

Used Ford Mustang"
657 Great Deals out of 42,225 listings starting at $1,500
Used Chevrolet Camaro"
452 Great Deals out of 26,429 listings starting at $2,950
Used Mitsubishi Eclipse"
49 Great Deals out of 1,786 listings starting at $2,599
Used Toyota Camry"
1,203 Great Deals out of 85,007 listings starting at $1,517
Used Toyota Corolla"
1,051 Great Deals out of 70,427 listings starting at $2,000
Used BMW 3 Series"
1,165 Great Deals out of 37,084 listings starting at $1,900
Used Hyundai Tiburon"
20 Great Deals out of 765 listings starting at $3,000
Used Volkswagen Jetta"
888 Great Deals out of 32,601 listings starting at $500
Used Mazda MX-5 Miata"
99 Great Deals out of 2,777 listings starting at $2,900
Used Ford Focus"
1,161 Great Deals out of 72,381 listings starting at $1,300
Used Mercury Grand Marquis"
60 Great Deals out of 2,637 listings starting at $1,295
Used Honda Civic Coupe"
289 Great Deals out of 10,149 listings starting at $900
Used Ford F-150"
3,136 Great Deals out of 178,951 listings starting at $1,450
Used Chevrolet Impala"
1,497 Great Deals out of 45,232 listings starting at $170