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 there's a problem with the part of the car that helps check how dirty the air coming out of the car is. It's like a tiny heater that isn't working right.
The P24B4 code indicates an issue with the heater control circuit of the particulate matter sensor, which is responsible for monitoring the soot levels in the exhaust gases.
The particulate matter sensor is equipped with a heater to ensure accurate readings by maintaining the sensor at an optimal temperature. The P24B4 code is triggered when the Engine Control Module (ECM) detects a performance issue or range problem in the heater control circuit of this sensor.
• Check Engine Light is on
• Reduced engine performance
• Increased emissions
• Faulty particulate matter sensor heater
• Wiring issues in the heater control circuit
• Faulty ECM or software issue
Particulate Matter Sensor: A device that measures the amount of soot in the exhaust gases.
ECM: Engine Control Module, the computer that controls the engine's functions.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connections to the particulate matter sensor.
• Test the sensor heater resistance and compare it to specifications.
• Repair or replace damaged wiring or connectors.
• Replace the particulate matter sensor if faulty.
• Update or reprogram the ECM if necessary.
• OBD-II scanner
• Multimeter
• Wiring repair tools
$150 - $500
Moderate
• Volkswagen Jetta
• Audi A3
• BMW 3 Series
• Regular maintenance checks
• Ensure clean fuel and air filters
• Use recommended fuel types
Sensor Issue
• Avoid driving long distances until the issue is resolved.
• Consult a professional mechanic for accurate diagnosis.
Check with the vehicle manufacturer for warranty coverage on emissions-related components.
This code has become more common with the introduction of stricter emissions standards and the use of particulate matter sensors in diesel engines.
Moderate – While the vehicle may still be drivable, it is important to address this issue to prevent increased emissions and potential engine damage.
Driving with this issue may lead to higher emissions, which can be illegal in areas with strict emissions laws.
• Engine at operating temperature
• Vehicle in idle or low-speed condition
The particulate matter sensor is typically located in the exhaust system, near the catalytic converter or diesel particulate filter.
Q: Can I drive with a P24B4 code?
A: It's possible to drive short distances, but it's best to get it fixed soon to avoid increased emissions and potential engine issues.
Q: How can I prevent this code from appearing again?
A: Regular maintenance and using the correct fuel can help prevent this issue.
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Fitment Required · Vehicle-fitment part
Relevant when catalyst-efficiency or emissions faults persist after proper diagnosis.
Catalyst-efficiency faults sometimes point toward converter problems after proper testing.
Catalytic converters are highly vehicle-specific and should not be purchased by code alone.
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.