Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car's computer is getting a signal that says the air going into the engine is too cold. It's like when a thermometer is broken and shows the wrong temperature.
The P1246 code indicates that the signal from the charge air temperature sensor is lower than expected by the engine control module (ECM).
The charge air temperature sensor measures the temperature of the air entering the engine. This information is used by the ECM to adjust fuel injection and ignition timing for optimal performance. A low circuit signal suggests an issue with the sensor or its wiring.
• Check Engine Light is on
• Poor engine performance
• Increased fuel consumption
• Faulty charge air temperature sensor
• Wiring issues such as shorts or open circuits
• Faulty ECM
ECM: Engine Control Module
OBD-II: On-Board Diagnostics II
• Use an OBD-II scanner to confirm the code.
• Inspect the charge air temperature sensor and its wiring.
• Test the sensor with a multimeter.
• Replace the charge air temperature sensor.
• Repair or replace damaged wiring.
• Replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Screwdriver set
$100 - $300
Moderate
• Ford Focus
• Volkswagen Golf
• BMW 3 Series
• Regularly inspect sensor wiring for damage.
• Keep the air intake system clean.
• Perform regular vehicle maintenance.
Sensor Issue
• Have the vehicle inspected by a professional.
• Avoid driving in extreme conditions until repaired.
Check if the vehicle's warranty covers sensor replacement.
This code has been associated with vehicles that have experienced wiring issues due to age or environmental factors.
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 stationary
The charge air temperature sensor is typically located in the intake manifold or air intake duct.
Q: Can I drive with a P1246 code?
A: It's possible to drive short distances, but it's best to fix the issue to avoid further problems.
Q: How does a faulty sensor affect my car?
A: It can cause poor fuel economy and reduced engine performance.
High-End · Full-system diagnostics
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Network faults often require full-system access instead of a generic code reader alone.
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Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
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Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
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Fitment Required · Vehicle-fitment part
Commonly relevant for misfire, ignition-efficiency, and some drivability-related repairs.
Misfire and ignition-related faults commonly involve spark plugs as part of the repair path.
Check the correct plug type, gap, and engine application for your vehicle.
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Fitment Required · Vehicle-fitment part
Relevant when the fault points toward ignition-coil performance or cylinder-specific ignition issues.
Some ignition faults involve coil performance or cylinder-specific coil problems.
Match the coil to your engine and confirm the failed component before ordering.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.