Diagnostic article Generic OBD-II
P2415: bank 2 front-oxygen feedback exceeds the CTUA signal-range criterion
Audi's CTUA P2415 entry evaluates the front oxygen-sensor signal above 3.1 V, while a parts diagnosis still requires the correct sensor and circuit evidence.
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Documented application
Audi 2014 A6/S6 Quick Reference Specification Book, September 2013, Engine Code CTUA, DTC chart. Thresholds only describe this documented monitor; not universal across other makes or engines.
The code alone does not identify a failed part or establish that a vehicle is safe to drive. Confirm the vehicle, reporting module and applicable service procedure.
P2415 is cataloged as an exhaust-sample error for bank 2 sensor 1. Audi's CTUA chart describes a front oxygen-sensor signal-range check and lists a signal above 3.1 V. The source therefore frames the fault as an evaluation of sensor feedback, not a direct instruction to replace the catalytic converter.
Bank and sensor position remain essential
The monitored feedback belongs to bank 2's front sensor in this row. As diagnostic interpretation, a plausible reading from a rear sensor or the other bank cannot independently explain why this signal-range criterion was exceeded. Correct identification must precede comparison.
The voltage threshold is not a measured air/fuel ratio or a published exhaust-temperature limit. Those quantities should not be inferred from the number without the appropriate sensor characteristic and operating information.
Keep the conclusion narrower than the repair
Audi's quick-reference table provides no complete isolation tree, wiring pinout or mandatory replacement. It identifies the controller's criterion. A supported repair requires evidence explaining the high front-sensor signal in the CTUA system. This article is limited to that engine section of the 2014 A6/S6 book and does not treat 3.1 V as a universal oxygen-sensor threshold for every P2415 implementation.
Article source documents
Source checks describe how the text was prepared; they do not certify a diagnosis or confirm compatibility with every vehicle using this code.
Original code reference
Dictionary definition
O2 Sensor Exhaust Sample Error Bank 2 Sensor 1
This definition retains its original catalog scope. The article above is limited to its explicitly documented application.
Reference scope
Generic OBD-II definition.
A manufacturer label does not establish the model, year, engine or module to which a diagnosis applies. Read the safety and diagnostic limits.
Definition source
- DTC Database: pinned community code definitions
Source checked · MIT