P0107 – MAP/BARO Pressure Circuit Low

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The P0107 code indicates a low voltage reading from the Manifold Absolute Pressure (MAP) sensor circuit. This diagnostic trouble code (DTC) is critical for proper engine management and fuel efficiency.

In our workshop, we've seen the P0107 code pop up quite frequently across various European makes, particularly on Volkswagen, BMW, and Peugeot models. We've noticed it's often caused by a faulty MAP sensor or wiring issues in the sensor circuit. In many cases, simply cleaning the sensor and its connections resolved the problem. However, for older vehicles, especially some Renault and Fiat models, we've had to replace the MAP sensor entirely. Interestingly, we've observed that this code tends to appear more often in cars with higher mileage, suggesting a correlation with general wear and tear. Overall, while P0107 can be frustrating, it's usually a straightforward fix in our experience.

Urgency Level

While P0107 doesn't typically require immediate vehicle shutdown, it's advisable to address the issue promptly. You can generally continue driving, but you may experience reduced fuel efficiency, rough idling, and decreased engine performance. It's recommended to have the vehicle inspected by a qualified technician within 1-2 weeks of the code appearing.

Detailed Code Information

P0107 is a generic powertrain code, meaning it applies to all makes and models of vehicles equipped with OBD-II systems. However, the specific diagnostic and repair procedures may vary slightly between manufacturers.

Parts Involved

  1. Manifold Absolute Pressure (MAP) sensor
  2. Engine Control Module (ECM)
  3. Wiring harness and connectors

Role of the MAP Sensor

The MAP sensor measures the pressure inside the intake manifold relative to atmospheric pressure. This data is crucial for the ECM to calculate engine load, determine proper fuel injection timing, adjust ignition timing, and control variable valve timing (in equipped vehicles).

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Common Causes

  1. Faulty MAP sensor
  2. Damaged wiring or connectors
  3. Vacuum leaks
  4. Clogged or restricted vacuum lines
  5. ECM malfunction (rare)

Diagnostic Procedure

  1. Connect an OBD-II scanner and verify the P0107 code
  2. Inspect the MAP sensor and its wiring for visible damage
  3. Check vacuum lines for leaks or restrictions
  4. Measure MAP sensor voltage output:
    • Key on, engine off: Should read about 4.5-5.0 volts
    • Engine idling: Should read about 1.0-1.5 volts
  5. Perform a voltage drop test on the MAP sensor circuit
  6. Check ground connection integrity
  7. Use a smoke machine to detect potential vacuum leaks
  8. If all tests pass, consider replacing the MAP sensor

Solutions

  1. Replace faulty MAP sensor
  2. Repair or replace damaged wiring/connectors
  3. Fix vacuum leaks
  4. Update ECM software (if applicable)
  5. In rare cases, replace ECM

Prevention

  1. Regular maintenance of the air intake system
  2. Periodic inspection of vacuum lines and electrical connections
  3. Use high-quality replacement parts when servicing the engine

Repair Costs

Parts Cost

  • MAP Sensor: $30-$180 (€25-€150)
  • Wiring Harness: $50-$200 (€42-€170)

Labor Cost

  • Diagnostic Time: 0.5-1 hour
  • Repair Time: 0.5-2 hours
  • Average Labor Rate: $75-$150 per hour (€63-€126 per hour)

Total Estimated Cost: $100-$500 (€84-€420)

DIY Repair Guide

  1. Locate the MAP sensor (typically on or near the intake manifold)
  2. Disconnect the negative battery terminal
  3. Unplug the electrical connector from the MAP sensor
  4. Remove any mounting bolts (usually 8-10mm)
  5. Remove the old sensor and install the new one
  6. Reconnect the electrical connector and battery
  7. Clear the DTC and test drive the vehicle
  • P0108: MAP Sensor Circuit High Input
  • P0106: MAP Sensor Circuit Range/Performance Problem
  • P0171/P0174: System Too Lean (Bank 1/Bank 2)
  • P0300: Random/Multiple Cylinder Misfire Detected

MAP sensors typically operate within a range of 10-105 kPa (1.45-15.23 psi) absolute pressure. At sea level, atmospheric pressure is approximately 101.3 kPa (14.7 psi).

Remember to always consult your vehicle's specific repair manual for precise diagnostic and repair procedures, as they may vary between makes and models.

Frequently Asked Questions (FAQ) About the P0107 Engine Code

What does the P0107 code mean?

P0107 indicates a low voltage input from the Manifold Absolute Pressure (MAP) sensor circuit to the Engine Control Module (ECM).

How urgent is it to address a P0107 code?

While not immediately critical, it's advisable to address the issue within 1-2 weeks to prevent potential engine performance issues and increased fuel consumption.

Can I continue driving with a P0107 code?

You can generally continue driving, but you may experience reduced fuel efficiency, rough idling, and decreased engine performance.

What are the common symptoms of a P0107 code?

Common symptoms include an illuminated check engine light, hard starting, poor fuel economy, and reduced engine performance.

What causes a P0107 code?

Common causes include a faulty MAP sensor, damaged wiring or connectors, vacuum leaks, and clogged or restricted vacuum lines.

How do I diagnose a P0107 code?

Use an OBD-II scanner to confirm the code, inspect the MAP sensor and wiring, check for vacuum leaks, and measure the MAP sensor voltage output.

How do I fix a P0107 code?

Depending on the cause, solutions may include replacing the MAP sensor, repairing wiring, fixing vacuum leaks, or updating ECM software.

What parts are typically involved with a P0107 code?

The main components are the MAP sensor, ECM, and associated wiring and connectors.

Is P0107 a generic or manufacturer-specific code?

P0107 is a generic powertrain code applicable to all OBD-II equipped vehicles.

What is the role of the MAP sensor in relation to the P0107 code?

The MAP sensor measures intake manifold pressure, providing crucial data for the ECM to manage engine performance and fuel efficiency.

How much does it typically cost to repair a P0107 code issue?

Repair costs can range from $100 to $500 (€84-€420), depending on the specific cause and required labor.

Can I replace the MAP sensor myself to fix a P0107 code?

Yes, MAP sensor replacement is often a DIY-friendly repair for those with basic mechanical skills.

What other codes are commonly associated with P0107?

Related codes include P0108 (MAP sensor circuit high input), P0106 (MAP sensor circuit range/performance problem), and P0171/P0174 (system too lean).

How can I prevent P0107 codes in the future?

Regular maintenance of the air intake system, periodic inspection of vacuum lines and electrical connections, and using high-quality replacement parts can help prevent P0107 codes.

What is the normal voltage range for a MAP sensor?

Typically, MAP sensors operate between 1V to 4.5V, with key-on/engine-off readings around 4.5-5.0V and idle readings around 1.0-1.5V.

Can a vacuum leak cause a P0107 code?

Yes, vacuum leaks can cause inaccurate MAP sensor readings, potentially triggering a P0107 code.

How does the P0107 code affect fuel economy?

The code can lead to incorrect fuel mixture calculations, potentially resulting in decreased fuel efficiency.

Can a faulty ECM cause a P0107 code?

While rare, a malfunctioning ECM can potentially cause a P0107 code.

How long does it typically take to diagnose and repair a P0107 code?

Diagnosis typically takes 0.5-1 hour, while repair time can range from 0.5-2 hours, depending on the specific issue.

Is it safe to clear the P0107 code without fixing the underlying issue?

While you can clear the code, it's not recommended as the underlying issue will persist and the code will likely return, potentially leading to more severe problems if left unaddressed.

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