P06EA

What it means

P06EA means the engine control unit has judged that the processor or control electronics for the bank 1 sensor 1 NOx sensor are not performing as expected. The NOx sensor's control module, which may be built into the sensor or fitted as a separate unit, sends data that is implausible, out of range, or fails the unit's own self-checks. Layout and strategy vary by model and engine.

Symptoms

• Malfunction indicator lamp on
• Possible warning message about the exhaust or emissions system
• Reduced engine power or limp mode on some vehicles
• Poor or unstable emissions control, or SCR system fault warnings on diesel models
• Possible restart or driving restrictions if the fault persists on some vehicles

Possible causes

• Failed NOx sensor or its integrated control modulelikely
• Damaged wiring, corroded or loose connector at the NOx sensor or control unitlikely
• Low or unstable supply voltage, or poor earth connection to the sensor modulepossible
• Communication fault on the data network between the sensor module and the engine control unitpossible
• Exhaust leak near the sensor, or heat or water damage to the sensor bodypossible
• Outdated or faulty engine control unit softwarerare
• Fault inside the engine control unit itselfrare

How to diagnose

1. Read all stored and pending codes and note freeze frame data, including engine load, temperature and battery voltage when the fault set.
2. Check for related codes such as NOx sensor circuit, heater, SCR efficiency or network communication faults, and diagnose those first if present.
3. Visually inspect the sensor, its wiring and connectors for chafing, heat damage, water ingress, corrosion and bent or pushed-back pins.
4. Check battery condition and charging voltage, as low or unstable voltage can upset the sensor module.
5. Check the power, earth and data circuits at the sensor connector against the manufacturer's wiring information.
6. Look for exhaust leaks upstream of the sensor and check the sensor body for physical damage.
7. Compare live NOx sensor readings with expected values, for example a plausible reading with the engine cold or off, and check the sensor reports as ready once warm.
8. Check for manufacturer service information or software updates relating to this code for the specific model and engine.

How to fix

• Repair or replace damaged wiring, terminals or connectors, and clean up any corrosion.
• Restore a good power supply and earth connection to the sensor module.
• Replace the NOx sensor assembly, or its separate control module if the model uses one, once the fault is confirmed.
• Repair any exhaust leak or fix the cause of water or heat damage near the sensor.
• Repair any network communication fault found on the data lines.
• Update the engine control unit software only if an outdated calibration is a known cause for that model.

Can I keep driving?

Nearby codes

• P06E9GenericEngine Starter Performance
• P06EBGenericNOx Sensor Processor Performance Bank 1 Sensor 2