P06EB: Ford downstream NOx sensor processor performance fault

P06EB is the bank 1 sensor 2 NOx processor-performance code in Ford's documented diesel system. Sensor 2 is described as a tailpipe sensor, typically downstream of the SCR and DPF. Its controller manages the sensing element and heater, so this code concerns the measurement system itself.

Several internal checks share the code

Ford lists memory-integrity failures, internal signal-range faults and a comparison between NOx measurement ranges among the possible triggers. The typical malfunction duration is five seconds. The 50–100 ppm window applies to the range-rationality sequence; it should not be represented as a prerequisite for every memory or electrical failure under P06EB.

The downstream placement makes the sensor important to aftertreatment assessment, but a processor fault is not a direct test result for SCR catalyst efficiency.

Keep sensor identity and fault type

P06EA is the sensor 1 counterpart, while P225B specifically identifies sensor 2 calibration-memory CRC failure. Preserve that distinction when reviewing a collection of exhaust codes. The summary cannot isolate the physical cause from the processor label alone. Use the correct sensor-controller service procedure and verify reliable measurement before drawing a conclusion about the catalyst's conversion performance.

Source and applicability

Ford 2015 model-year diesel OBD system operation summary, revision December 22, 2014; the cited monitor only, without blanket model or engine applicability. Ford source, physical PDF page 49. The documented monitor explains the fault decision; vehicle-specific service information is still needed for connector identification and a complete repair procedure.