Multiair actuator Fiat Alfa Lancia Jeep

Typical Defects:
Failure to ignite one or more cylinders
The vehicle does not start
Engine control system malfunction indicator light is on

Error Codes:
P0300 - Multiple cylinder misfires
P0301 - Misfire on cylinder 1
P0302 - Misfire on cylinder 2
P0303 - Misfire on cylinder 3
P0304 - Misfire on cylinder 4
P1061 - Solenoid valve signal for cylinder module 1
P1062 - Solenoid valve signal for cylinder module 2
P1063 - Solenoid valve signal for cylinder module 3
P1064 - Solenoid signal for cylinder module actuation 4
P1524 - Anti-soiling function for spark plugs

The MAIR 001 (code OE 55272426) is the MultiAir module used in 1.4 gasoline engines (both naturally aspirated and turbocharged) employed in numerous vehicles of the Stellantis Group. Among the main equipped models are:

• Abarth: 124 Spider, Punto Evo
• Alfa Romeo: Giulietta, MiTo
• Fiat: 124 Spider, 500X, Bravo II, Punto, Punto Evo
• Jeep: Renegade
• Lancia: Delta III

The MultiAir module is an electro-hydraulic unit that uses engine oil as the actuation fluid to control the opening of the intake valves in a fully variable manner, without the direct use of the camshaft.

The system interprets driving parameters in real time (accelerator pressure, engine speed, engaged gear, etc.) and adjusts the valve lift independently from any other mechanical control.

DIPA can intervene to overhaul these modules thanks to its experience and expertise.

Symptoms of failure of the MultiAir module OE 55272426

Problems with the MultiAir module generally manifest as irregular fueling, loss of power, delayed throttle response, and in more severe cases, inability to start the engine. The illumination of the engine warning light is a frequent signal. Below are the most common failures.

Clogging of hydraulic channels

Engine oil is the medium through which the MultiAir module activates the valves. The use of poor-quality oils or oil changes spaced too far apart causes the formation of sludge that clogs the internal channels of the module. Symptoms include:

• Irregular operation
• Performance drop
• Difficulty starting

Failure of electro-hydraulic actuators

The module integrates solenoids that control the oil flow. If one of these fails, the engine may:

• Stutter while driving
• Noticeably lose power
• Struggle to start

This problem is common after 100.000 km, but can also occur earlier under severe conditions.

ECU errors and recovery mode

When the ECU detects an anomaly in the MultiAir module, it can activate the emergency mode (Limp Mode). In this condition:

• The engine runs with reduced performance
• The engine warning light remains on
• Error codes related to valve actuation are recorded

Abnormal noises and irregular knocking

A clogged or damaged module can cause:

• Metallic knocking when cold
• Irregular idle
• Increased noises during the starting phase

Failure of the internal pressure valve

The integrated pressure valve manages the stability of the oil inside the circuit. In case of failure, the following occur:

• Idle oscillations (e.g., between 600 and 900 rpm)
• Reduced opening of the intake valves
• Reduced performance and increased consumption

Degradation of internal seals

With wear, the internal hydraulic seals can lose tightness:

• Oil leakage around the module
• Abnormal pressure variations
• Progressive malfunction of valve actuation
• Increased engine oil consumption

Prevention of MultiAir module failures

To ensure the longevity of the module, DIPA recommends:

• Changing the oil every 15.000 km or once a year, even if the manufacturer indicates longer intervals
• Using only lubricants compliant with the required specifications: it is not enough to respect the viscosity (0W30 or 5W40), but also the ACEA C3 and Fiat 955535-S2 certifications
• Avoid revving the engine cold or keeping it at high RPMs in non-optimal conditions

Error codes associated with failure of the MAIR OE 55272426 module

Failures of the MultiAir module frequently generate errors stored in the ECU. Among the most common are:

• P0300 – Multiple cylinder misfires
• P0301 – Misfire in cylinder 1
• P0302 – Misfire in cylinder 2
• P0303 – Misfire in cylinder 3
• P0304 – Misfire in cylinder 4
• P1061 – Actuator anomaly in cylinder 1
• P1062 – Actuator anomaly in cylinder 2
• P1063 – Actuator anomaly in cylinder 3
• P1064 – Actuator anomaly in cylinder 4
• P1524 – Spark plug fouling prevention function

Conclusion

The MultiAir OE 55272426 module is a sophisticated component that plays a crucial role in intake management and the dynamics of the 1.4 gasoline engine. Its failure heavily affects performance, starting, consumption, and emissions.

DIPA performs a complete overhaul of the MultiAir module with testing of all functions, replacement of seals, and bench testing. Also inquire about the availability of remanufactured modules ready in stock for quick interventions without waiting times.