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Mercury E7FZ-12A644-A Sensor Assembly

1987-1991 Mercury E7FZ12A644A

Customer Questions & Expert Answers (3)
Ford E7FZ-12A644-A Sensor Assembly
  • Part Description
    Sensor Assy
  • Base No.
    12A644
  • Manufacturer
    Ford
  • Manufacturer's Notes
    This part is discontinued.
Make sure this part fits
  • Related Parts
  • Product Specifications
  • Vehicle Fitment
  • Customer Questions & Expert Answers
  • Product Specifications

    BrandGenuine Mercury
    Base No.12A644
    Manufacturer Part NumberE7FZ-12A644-A, E7FZ12A644A
    Part DescriptionSensor Assy
    Other NamesBarometric Sensor
    Item Dimensions4.9 x 4.7 x 1.7 inches
    Item Weight0.40 Pounds
    ConditionNew
    Fitment TypeDirect Replacement
    ManufacturerFord
    SKUE7FZ-12A644-A
    WarrantyThis genuine Ford part is guaranteed by Ford's factory warranty.
    Shipping & ReturnShipping Policy Return Policy
    Warning: California’s Proposition 65
  • Vehicle Fitment

    Year Make Model Engine Important vehicle option details
    1990-1991 Mercury Grand Marquis8 Cyl 5.0L4AT AOD
    1987 Mercury Lynx4 Cyl 1.9L3AT ATX, 4MT, 5MT
  • Customer Questions & Expert Answers

    Q:
    I would like to know is this part gonna fit with my car Posted by FordPartsGiant Specialist
    A:
    You can Select Your Vehicle to check if E7FZ-12A644-A fits your vehicle.
    Posted by FordPartsGiant Specialist
    Q:
    How to check and replace the Brake Light Switch,Camshaft Position Sensor,Coolant Temperature Sensor,Crankshaft Position Sensor,Intake Manifold Temperature Sensor,MAP Sensor,Mass Air Flow Sensor,Neutral Safety Switch,Oxygen Sensors,Throttle Position Sensor and Vehicle Speed Sensor on Lincoln Town Car? Posted by Customer
    A:
    The engine coolant temperature sensor is a thermistor that varies its voltage output based on temperature changes. Resistance values decrease as the sensor temperature increases and vice versa. Failure in the coolant sensor circuit triggers codes 21, 51, or 61 (two-digit) or 116, 117, 118 (three-digit). Resistance values should be checked while cold (58,750 to 40,500 ohms) and at operating temperature (3,600 to 1,840 ohms). Signal voltage to the sensor from the PCM should be around 5.0 volts. During replacement, wait for the engine to cool, use Teflon tape on threads, and handle the sensor with care.The Manifold Absolute Pressure (MAP) sensor monitors intake manifold pressure changes, converting them into a voltage output. A failure triggers codes 22 or 72 (two-digit) or 126, 128, 129 (three-digit). Check reference voltage (4.0 to 6.0 volts), backprobe the MAP/BP Signal wire, and apply vacuum to observe tachometer readings. Incorrect results indicate MAP sensor replacement.Oxygen sensors monitor exhaust oxygen content, adjusting air/fuel mixture. Check for a steady signal voltage between 0.35 and 0.55 volts at normal operating temperature. Codes 41, 42, 91, 92 (two-digit) or 136, 137, 139, 144, 171-178 (three-digit) indicate issues. Ensure the oxygen sensor heater receives battery voltage. Special care during service is essential.The Throttle Position Sensor (TPS) monitors throttle angle. Check for proper signal voltage (0.50 to 1.0 volts at idle, 4.0 to 5.0 volts at full throttle) and reference voltage (approximately 5.0 volts). Check potentiometer resistance (0.8 to 1.0 K ohms at closed throttle, 3.0 to 4.0 K ohms at full throttle). Replace if readings are incorrect.The Mass Air Flow (MAF) sensor, for 4.6L engines, measures air entering the engine. Check for power, signal voltage (0.2 to 1.5 volts at idle, increasing to about 2.0 volts at 60 mph), and use an ohmmeter for resistance checks. Replacement involves disconnecting the electrical connector, removing the air cleaner assembly, and uninstalling the MAF sensor.The Manual Lever Position (MLP) sensor, now Transmission Range (TR) sensor, indicates transmission gear. Check terminal connectors for attachment, verify power, and adjust if necessary. Diagnostics require special tools.The air conditioning clutch control involves PCM control of the compressor clutch. If the air conditioning does not function, check relays and switches. To test, remove the relay and bridge the battery feed and compressor clutch terminals. The Vehicle Speed Sensor (VSS) monitors speed, usually setting Code 24 if faulty. Check for signal voltage (10 volts or more). Replacement involves disconnecting the electrical connector, removing the retaining bolt, and lifting the VSS from the transmission. The Intake Manifold Temperature Sensor measures air temperature entering the engine. Check for correct reference voltage (5 volts) and resistance changes with temperature. Code 54 indicates issues.The power steering pressure switch affects idle quality. Problems may set Code 52. Check for open or closed circuits affecting engine timing.The crankshaft position sensor defines engine position for the PCM, and any issues require professional diagnosis. Replacement involves removing the electrical connector and retaining bolt.The camshaft position sensor is triggered by the camshaft sprocket's high point. Diagnostic work should be done by professionals.The Brake Light Switch informs the PCM when brakes are applied. Ensure proper voltage and continuity, and replace if needed. Brake light circuit and bulb conditions can impact idle quality.
    Posted by FordPartsGiant Specialist
    Q:
    How does the Manifold Absolute Pressure (MAP) sensor work, and what checks can be performed on it for the 1980 Ford F-250? Posted by Customer
    A:
    The MAP sensor monitors intake manifold pressure changes. To check it, verify the reference voltage, determine the sensor type, and test the sensor's response with a vacuum pump.
    Posted by FordPartsGiant Specialist
    See expert answers on similar MAP Sensor
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Genuine Ford Part E7FZ-12A644-A, the Right Choice

Your vehicle deserves only genuine OEM Ford parts and accessories. To ensure reliability, purchase Ford part # E7FZ-12A644-A Sensor Assembly with base parts number 12A644. It is sometimes referred to as Mercury MAP Sensor. Our Ford parts and accessories are expedited directly from authorized Ford dealers strategically located all across the U.S. and are backed by the manufacturer's 12 month, 12,000 mile warranty. OEM Ford parts are the best for restoring your vehicle to factory condition performance. This part fits specific Mercury Grand Marquis, Lynx models.

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