Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer is having trouble with two important sensors that help the engine run smoothly. One sensor checks how much the gas pedal is pressed, and the other measures how much air is going into the engine.
The P1142 code is triggered when there is a discrepancy between the readings of the Throttle Position Sensor 2 and the Hot Film Air Mass Meter on Bank 2.
The Throttle Position Sensor (TPS) measures the position of the throttle. The Hot Film Air Mass Meter (HFM) measures the mass of air entering the engine. The engine control module (ECM) compares these readings to ensure they align with expected values. A mismatch can trigger the P1142 code.
• Check Engine Light is on
• Poor engine performance
• Increased fuel consumption
• Faulty Throttle Position Sensor 2
• Faulty Hot Film Air Mass Meter
• Wiring or connection issues in the sensor circuits
Throttle Position Sensor: A sensor that measures the position of the throttle in the engine.
Hot Film Air Mass Meter: A device that measures the amount of air entering the engine.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connections of the TPS and HFM.
• Test the TPS and HFM for proper operation.
• Replace the Throttle Position Sensor 2 if faulty.
• Replace the Hot Film Air Mass Meter if faulty.
• Repair or replace damaged wiring or connectors.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• Mercedes-Benz E-Class
• BMW 5 Series
• Audi A6
• Regular maintenance checks
• Keep sensors clean and free of debris
• Ensure proper electrical connections
Sensor Issue
• Have the vehicle inspected by a professional.
• Avoid driving aggressively until the issue is resolved.
Check if the vehicle's warranty covers sensor replacements.
This code is common in vehicles with high mileage or those that have not been regularly maintained.
Moderate – It should be addressed soon to prevent further engine performance issues.
Ignoring this code may lead to increased emissions and potential engine damage.
• Engine at operating temperature
• Vehicle idling in park or neutral
The Throttle Position Sensor is located on the throttle body, and the Hot Film Air Mass Meter is located in the air intake system.
Q: Can I drive with a P1142 code?
A: It's possible to drive for a short period, but it's best to fix the issue soon to avoid further problems.
Q: Will a P1142 code affect fuel economy?
A: Yes, it can lead to increased fuel consumption due to improper air-fuel mixture.
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