• Check Engine Light is on
• Poor fuel economy
• Increased emissions
• Faulty NOx sensor
• Damaged wiring or connectors
• ECM software issue
NOx: Nitrogen Oxides, pollutants produced during combustion.
ECM: Engine Control Module, the computer that controls the engine's functions.
• P124B
• P124D
This code means that the car's computer isn't getting a signal from a sensor that checks for certain gases in the exhaust when the car starts.
The NOx sensor is responsible for detecting nitrogen oxides in the exhaust. This code is triggered when the sensor does not send a signal during the initial startup of the engine.
The P124C code indicates that the Engine Control Module (ECM) has not received a signal from the NOx sensor on Bank 1 during engine startup. This could be due to a malfunctioning sensor, wiring issues, or a problem with the ECM itself.
• Use an OBD-II scanner to confirm the code.
• Inspect the NOx sensor and its wiring for damage.
• Test the NOx sensor for proper operation.
• Replace the faulty NOx sensor.
• Repair or replace damaged wiring or connectors.
• Update the ECM software if needed.
• OBD-II scanner
• Multimeter
• Wrench set
$200 - $600
Moderate
• Ford F-150
• Chevrolet Silverado
• Dodge Ram
• Regular maintenance checks
• Timely replacement of sensors
• Ensure proper fuel quality
Sensor Issue
• Do not ignore the Check Engine Light.
• Have your vehicle inspected by a professional mechanic.
Check with your vehicle manufacturer for warranty coverage on emissions-related components.
This code has been more prevalent in vehicles with advanced emissions systems, especially those with diesel engines.
Moderate – Should be addressed to prevent increased emissions and potential engine performance issues.
Driving with a malfunctioning emissions system may violate emissions regulations and contribute to environmental pollution.
• Engine startup
• Cold start conditions
The NOx sensor is typically located in the exhaust system, near the catalytic converter on Bank 1.
Q: Can I drive with a P124C code?
A: While the car may still be drivable, it's best to address the issue to avoid increased emissions and potential engine problems.
Q: What is a NOx sensor?
A: A NOx sensor measures the levels of nitrogen oxides in the vehicle's exhaust to help reduce emissions.