P0107 on 2018-2019 Ford Taurus: MAP Sensor Circuit Low Causes and Fixes

What's Unique About the 2018-2019 Ford TAURUS

For the 2018-2019 Ford Taurus equipped with the 3.5L EcoBoost engine, this code is frequently linked to a known issue. Ford issued Technical Service Bulletins (TSB 19-2183 and the superseding TSB 19-2212) acknowledging that a faulty Manifold Absolute Pressure and Temperature (MAPT) sensor is a common cause for P0107. These TSBs specifically note that this failure is often accompanied by a cluster of warning messages, including the powertrain malfunction (wrench) light, "Service AdvanceTrac," and "Hill Start Assist Not Available". This makes diagnosis more direct compared to other vehicles where wiring or vacuum leaks might be equally probable causes. The EcoBoost engine uses multiple pressure sensors, but the TSBs point specifically to the sensor located on top of the intake manifold.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this vehicle.

Symptoms You May Notice

• Check Engine Light (Malfunction Indicator Lamp) illuminated
• Powertrain Malfunction (Wrench) light on
• "Service AdvanceTrac" message displayed
• "Hill Start Assist Not Available" message displayed
• Significant lack of engine power or sluggishness, may feel like a transmission issue.
• Rough or unstable idle
• Engine stalling
• Poor fuel economy
• Hesitation or misfires during acceleration
• Black smoke from the exhaust.

Most Likely Causes

1. Faulty Manifold Absolute Pressure and Temperature (MAPT) Sensor 🔴 High Probability This is a known failure item for the 3.5L EcoBoost engine, as identified by Ford in TSB 19-2183 and TSB 19-2212. The sensor is located directly on the intake manifold and is subject to heat and vibration.
   How to confirm: Use a scan tool to monitor the MAP sensor's pressure reading (PID) with the key on and engine off. Compare it to the barometric pressure (BARO) PID and the Turbocharger Boost Pressure (TCBP) PID. If the MAP value differs from the others by more than 10.35 kPa (1.5 psi), the sensor is faulty. This is the diagnostic procedure specified by Ford in the TSB.
   Typical fix: Replace the MAPT sensor located on the top of the intake manifold. It is held in by a single T20 Torx screw. 🎬 Watch: Step-by-step MAP sensor replacement for the 3.5L EcoBoost. The engine cover must be removed for access. It is recommended to apply a small amount of lubricant to the new sensor's O-ring for easier installation.
   Est. part cost: $75-$130
2. Wiring or Connector Issue 🟡 Medium Probability Wiring harnesses in the engine bay are subject to heat and vibration which can lead to chafing or loose connections over time.
   How to confirm: Visually inspect the MAPT sensor connector and wiring harness for any signs of damage, corrosion, or loose connections. Use a multimeter to check for a 5-volt reference signal and a good ground at the connector with the key on. A reading below 5 volts on the reference wire or a bad ground points to a wiring issue, 🎬 Watch this guide to fixing P0107 circuit low faults. not a sensor failure.
   Typical fix: Repair the damaged section of the wiring harness or clean/replace the connector. Ensure the connector locking tab engages fully.
   Est. part cost: $5-$50
3. Large Vacuum Leak ⚪ Low Probability
   How to confirm: A significant vacuum leak would be required to drop manifold pressure enough to set this code at idle. Listen for hissing sounds around the intake manifold. A smoke test is the most effective way to find the source of a vacuum leak. You can also spray a combustible fluid like brake cleaner around suspected leak points with the engine running; a change in engine idle indicates the leak's location.
   Typical fix: Replace the leaking vacuum hose or intake manifold gasket.
   Est. part cost: $10-$200

Rare But Worth Checking

• Faulty Powertrain Control Module (PCM): This is extremely rare. The PCM should only be considered after all other possibilities, including the sensor, wiring, and vacuum leaks, have been definitively ruled out.
• Clogged Catalytic Converter: A severely restricted exhaust can cause abnormal pressure readings in the intake manifold, potentially triggering a P0107 code. This would typically be accompanied by other codes and a more severe loss of power.

Diagnosis Steps

1. Connect an OBD-II scanner and confirm P0107 is present. Check for other codes like P0108 or P0109, as noted in TSB 19-2212. Note the presence of any dashboard warnings like 'Service AdvanceTrac'.
2. With the Key On, Engine Off (KOEO), use the scanner's live data function to view the MAP, BARO, and TCBP sensor pressure readings (PIDs). They should all be nearly identical (within 1.5 psi or 10.35 kPa).
3. If the MAP reading is significantly lower than the BARO and TCBP readings, the MAPT sensor is the primary suspect.
4. Locate the MAPT sensor on top of the intake manifold. Remove the plastic engine cover for access. Visually inspect the sensor, its electrical connector, and the surrounding wires for any obvious damage, fraying, or corrosion.
5. If the visual inspection is clear, disconnect the sensor and test the connector. Use a multimeter set to DC volts to verify the reference wire has ~5 volts and the ground wire has good continuity to the chassis ground.
6. If wiring power and ground are confirmed, and the initial PID readings were incorrect, the MAPT sensor is faulty and should be replaced.
7. If the sensor and wiring test good, the issue is less common. Check for a major vacuum leak using a smoke machine.
8. If no vacuum leaks are found, the problem could be a restricted exhaust or, in very rare cases, a faulty PCM.

Parts You'll Likely Need

• Manifold Absolute Pressure and Temperature (MAPT) Sensor (OEM #AA5Z-9F479-E) — This is the most common cause of P0107 on the 3.5L EcoBoost Taurus, as identified in Ford's TSB 19-2212. It is the specific part number listed in the bulletin to correct the condition.
  Trusted brands: Motorcraft, Bosch, NTK
  OEM price range: $90-$130.
  Aftermarket price range: $35-$70

Related Codes That Often Appear With This One

• P0108 — This code for 'MAP/Barometric Pressure Circuit High' can appear with P0107 due to the same faulty sensor providing erratic readings. The TSB specifically mentions this code appearing alongside P0107.
• P0109 — This code for 'MAP/Barometric Pressure Circuit Intermittent' is also mentioned in the TSB as a related code caused by a failing MAPT sensor.
• U0121 — In some cases, a fault in the ABS module can trigger the 'Service AdvanceTrac' light. If this code is present alongside P0107, it could indicate a more complex electrical issue, though the MAP sensor is still the primary suspect for the P0107 code itself.

Technical Service Bulletins (TSBs) & Recalls

• TSB 19-2212: Supersedes the earlier TSB. Issued for 2018-2019 Taurus, Explorer, Flex, and MKT with the 3.5L EcoBoost. It identifies a faulty MAPT sensor (part AA5Z-9F479-E) as the cause for DTCs P0107, P0108, and/or P0109 accompanied by multiple dash warnings.
• TSB 19-2183: The original bulletin addressing the same issue, later updated by TSB 19-2212. It provides the key diagnostic step of comparing MAP, BARO, and TCBP PIDs.

Platform-Specific Known Issues

• A Technical Service Bulletin (TSB 19-2212, which superseded TSB 19-2183) was issued for 2018-2019 Taurus models with the 3.5L EcoBoost engine for this specific code, pointing directly to a faulty MAPT sensor as the cause.
• The 3.5L EcoBoost engine platform is known for potential carbon buildup on intake valves due to its direct-injection design, which can affect engine performance over time, but is not a direct cause of P0107.
• The 'Service AdvanceTrac' message is a common secondary symptom of this MAP sensor failure because the stability control system relies on accurate engine torque data, which is skewed by the bad sensor reading.

Mechanic-Grade Diagnostic Values

• MAP Sensor 5V Reference Wire Voltage — expected: 4.8V to 5.2V DC with key on, engine off (KOEO).. Failure: Voltage below 4.8V or absent indicates a wiring issue or PCM fault, not a sensor failure.
• MAP Sensor Ground Wire Voltage — expected: Less than 0.10V (100 millivolts) when back-probed to the battery positive terminal.. Failure: Higher voltage indicates a poor ground connection, which can cause incorrect sensor readings.
• MAP Sensor Signal Wire Voltage (KOEO) — expected: For a turbocharged engine, this should be between 2.0V and 3.0V at sea level, corresponding to atmospheric pressure.. Failure: A voltage below 0.5V will trigger code P0107.
• MAP Sensor Signal Wire Voltage (Engine Idling) — expected: Voltage should drop to between 1.0V and 2.0V once the engine is running and a vacuum is created.. Failure: Voltage that does not drop after starting, or remains below 0.5V, points to a faulty sensor or a major vacuum leak.

Wiring & Ground Locations

• MAP Sensor Connector — On top of the intake manifold, connected to the MAPT sensor.. This is the primary connection to test for 5V reference, ground, and signal voltage. A poor connection here is a common cause of the code.
• PCM Engine Harness Ground — The main ground strap for the engine harness is located on the transmission case, below the brake booster.. A faulty or corroded main ground can disrupt the MAP sensor's ground circuit, which is provided by the PCM, leading to low voltage readings and a P0107 code.

Real Owner Repair Stories

• AliExpress User Review (2014 Chevrolet Silverado 1500 LTZ 3.6L V6) — Intermittent stalling on warm restarts, persistent P0107 code.
  ❌ Tried (didn't work) Replacing MAF (Mass Airflow) sensor, Replacing PCV (Positive Crankcase Ventilation) valve, Testing for bad ground wire (passed), Considering PCM replacement
  ✅ What actually fixed it Replacing the Manifold Absolute Pressure (MAP) sensor finally resolved the P0107 code and stalling issues, even though the old sensor had no visible damage.

OEM Part Supersession History

• 2R3Z-9F479-AA → AA5Z-9F479-A — Part revision and update.
• AA5Z-9F479-A → AA5Z-9F479-B — Part revision and update.
• AA5Z-9F479-B → AA5Z-9F479-D — Part revision and update.
• AA5Z-9F479-D → AA5Z-9F479-E — Latest revision specified in TSB 19-2212 for the 2018-2019 Taurus to correct P0107 issues.
  Heads up: While older versions may fit, AA5Z-9F479-E is the specific part recommended by Ford to resolve the known issue on this platform.