P30B4
NOx Sensor 1 Signal Message Counter Incorrect
P30B4 is an OBD-II diagnostic trouble code meaning: NOx Sensor 1 Signal Message Counter Incorrect. Common causes: nox sensor 1 malfunction, problems with wiring to the sensor. Estimated repair cost: $56–167.
Symptoms
- Check Engine Light Is On
- Reduced engine power
- Increased fuel consumption
- Possible transition to emergency mode
- Increased emissions of harmful substances
Causes
- NOx sensor 1 malfunction
- Problems with wiring to the sensor
- Corrosion or poor contact in connectors
- Engine control module malfunction
- Sensor power problems
How to Fix
- Check the integrity of the wiring to the sensor
- Check connections and connector contacts
- Test the NOx sensor using diagnostic equipment
- If necessary, replace NOx sensor 1
- Reset the error code and check the system
Related codes
FAQ
What does the P30B4 code mean?
P30B4 is an OBD-II diagnostic trouble code that indicates: NOx Sensor 1 Signal Message Counter Incorrect
What causes a P30B4 error code?
The most common causes of P30B4 include: NOx sensor 1 malfunction; Problems with wiring to the sensor; Corrosion or poor contact in connectors; Engine control module malfunction.
How do I fix a P30B4 diagnostic trouble code?
To fix P30B4: Check the integrity of the wiring to the sensor. Check connections and connector contacts. Test the NOx sensor using diagnostic equipment. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P30B4?
Yes, but get it checked soon
How much does it cost to fix P30B4?
The estimated repair cost for P30B4 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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