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P2214 is a diagnostic trouble code (DTC) for "NOx Sensor Circ Range/Perf Bank2". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
The P2214 code occurs when the powertrain control module has detected that the nitric oxide and nitrogen dioxide gases (NOx) sensor circuit voltage reading is not in the anticipated levels for the engine bank (in this instance it is Perf Bank 2) it monitors.
A P2214 code is an OBD-II generic code cued when the PCM cannot obtain the data it needs to calculate the typical NOx sensor circuit input data. This is the result of temperature and exhaust composition data received from oxygen sensors upstream and downstream from the PCM. The PCM uses the data to get the optimal NOx sensor readings for the catalytic converters. Because upstream readings will vary in accordance to changes in fuel mixture, if readings of upstream and downstream data are too close in terms of levels or times, it triggers this code.
There are several causes for the P2214, including:
Typically, the P2214 code is accompanied by minor symptoms that range from the service engine light and the storage of the code, but there are risks for engine stall or no start conditions. Should the catalytic converter have sustained damage, such as melted parts, the engine performance may decline, there may be hesitation or loud hissing sounds when accelerating.
Usually, the P2214 is diagnosed with an OBD-II scanner. A mechanic will verify the code, look for additional codes (especially other oxygen sensor or catalytic converter codes) and then take the data and freeze frame data to determine when the code was set. They clear the codes and retest. If they return, the mechanic does a visual inspection of all of the wiring and connections, looking for corrosion, signs of shorts or loose connectors.
They then inspect the exhaust system for leaks and use a temperature gun to track conditions and compare with manufacturer recommendations. They will then test oxygen sensors and NOx sensors using voltage meters, narrowing the scanner's data fields to the specific sensors.
The most frequent mistake made when diagnosing the P2214 code is to assume it is a catalytic converter issue. Often, other codes occur and cannot be ignored when diagnosing this code as it may lead to an unnecessary catalytic converter replacement. Oxygen sensor failure could be the cause, and this must be fully investigated before any components are replaced.
The P2214 code may lead to a no start or engine stall condition, making it a serious matter. If appearing with additional codes that have been held for extended periods, it can also cause catalytic converter damage or failure. Though there may be no drivability issues, it is not a code to overlook.
Repairing the P2214 code may require:
The failure of control modules is a rarity and must be seen as the last possible issue when all other diagnostics fail to yield a solution to the recurring code. If modules are replaced, it typically means reprogramming is required. This is why it is best to start with oxygen sensor codes, then look at fuel trim, fuel mixture or misfire codes before working on the NOx sensor circuit issue.
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