A P0106 – Manifold Absolute Pressure (MAP) Sensor Range/Performance Fault on the 2018 MG ZS indicates that the Engine Control Module (ECM) has detected that the MAP sensor signal is outside the expected operating range or is inconsistent with other engine operating parameters, such as throttle position, engine speed, intake air temperature, and Mass Air Flow (where applicable).

The MAP sensor measures the absolute pressure inside the intake manifold, allowing the ECM to determine engine load and accurately calculate fuel injection, ignition timing, and Variable Valve Timing (VVT) operation.

When the sensor reading becomes implausible or fails the ECM’s rationality checks, Diagnostic Trouble Code P0106 is stored and the Check Engine Light is illuminated. Common causes include a faulty MAP sensor, vacuum leaks, intake restrictions, wiring faults, or engine mechanical issues affecting manifold pressure.

Symptoms

• Check Engine Light illuminated
• Diagnostic Trouble Code (DTC) P0106 stored
• Rough or unstable idle
• Engine hesitation during acceleration
• Reduced engine performance
• Poor throttle response
• Increased fuel consumption
• Hard starting
• Engine stalling
• Additional intake air or fuel system Diagnostic Trouble Codes may also be present

Possible Causes

The fault may be caused by a defective Manifold Absolute Pressure (MAP) sensor, vacuum leaks, cracked or disconnected intake hoses, damaged intake manifold gasket, blocked MAP sensor port, carbon contamination, damaged wiring harnesses, loose or corroded electrical connectors, poor ground connections, restricted air intake, throttle body contamination, faulty Mass Air Flow (MAF) sensor, Engine Control Module (ECM) faults, or CAN Bus communication issues affecting engine management. Vacuum leaks, contaminated MAP sensor ports, and wiring faults are among the most common causes of DTC P0106.

Diagnosis

Diagnosis begins by connecting a professional diagnostic scan tool to retrieve DTC P0106 together with any related fuel trim, throttle position, MAF sensor, intake air temperature, or oxygen sensor Diagnostic Trouble Codes. Freeze-frame data and live data should be analysed to monitor MAP sensor readings, engine load, manifold pressure, throttle position, intake air temperature, fuel trim values, engine speed, and battery voltage. The measured MAP value should be compared with expected manifold pressure under idle, cruise, and acceleration conditions to determine whether the signal is plausible.

A P0106 fault is not always caused by a failed MAP sensor. Technicians typically inspect the intake manifold, vacuum hoses, PCV system, throttle body, and air intake ducting for leaks or restrictions before replacing the sensor. The MAP sensor should be inspected for contamination or blocked pressure ports and tested for correct 5-volt reference, ground, and signal output. Wiring harnesses, electrical connectors, battery voltage, engine ground circuits, and related sensors should also be evaluated. Smoke testing of the intake system is commonly performed to identify vacuum leaks that may affect manifold pressure readings.

If the MAP sensor and associated intake and electrical systems operate within specification, further diagnosis should include evaluation of the Engine Control Module, fuel injection system, engine mechanical condition, and the CAN Bus communication network. Access to OEM wiring diagrams, connector pinouts, MAP circuit descriptions, live data specifications, vacuum system diagrams, component locations, and manufacturer diagnostic flowcharts is essential for accurate fault isolation. Following the OEM troubleshooting workflow helps identify the root cause efficiently while avoiding unnecessary replacement of sensors, intake components, wiring harnesses, or electronic control modules.

Recommended Resources

OEM Service and Repair Manual

The OEM Service and Repair Manual is the most reliable resource for diagnosing and repairing a P0106 MAP Sensor Range/Performance Fault. It typically includes:

• Diagnostic procedures specific to DTC P0106
• Engine management wiring diagrams and circuit descriptions
• Manifold Absolute Pressure (MAP) sensor testing procedures
• MAP sensor power, ground, and signal circuit diagnostics
• Intake manifold vacuum testing procedures
• Vacuum leak inspection and smoke testing procedures
• Throttle body and intake system diagnostic procedures
• Connector pinout information
• Component locations and removal procedures
• OEM troubleshooting workflows
• Repair specifications and electrical testing procedures

To order the correct OEM Service and Repair Manual for your 2018 MG ZS, submit your request using the form below and our team will provide the ordering details.