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P2200 code definitionA P2200 code means that the PCM has detected readings in a NOx (nitric oxide/nitrogen dioxide) sensor circuit that’s out of parameters for a specific engine bank. What the P2200 code meansThe PCM analyzes data on exhaust gas composition and temperature from the engine’s oxygen sensors, and calculates typical limits for NOx sensor circuit inputs. If these levels aren’t detected, the PCM will store a hard trouble code and illuminate the malfunction indicator lamp (MIL). What causes the P2200 code?More often than not, the P2200 code is caused by a failed catalytic converter. In some cases, a failed O2 sensor can be a possibility, but usually an O2 sensor-related code will accompany a catalytic converter code. Catalytic converters are designed to last the entire life cycle of the vehicle – meaning that a catalytic converter failure is due to another problem, such as:
Bear in mind that a leaky exhaust manifold, down pipe, flex hose or several other exhaust components mounted upstream from the catalytic converter can also mimic the symptoms of catalytic converter failure and register a code in the PCM. What are the symptoms of the P2200 code?Symptoms of a P2200 code can include:
How does a mechanic diagnose the P2200 code?While a catalytic converter is mounted in the exhaust stream and may resemble a muffler or resonator, its design and function differ greatly from a muffler. Catalytic converters get much hotter than a muffler while the engine is running, and remain hot after the engine is driven. A catalytic converter unit uses a network of interwoven fibers, including a high amount of platinum, packed into the metal housing. These fibers help filter out noxious oxide fragments left over in the exhaust gases, incinerating them at 500 to 800 degrees Fahrenheit. Conditions such as retarded ignition timing, lean-burning fuel mixtures and engine misfires can raise catalytic converter temperatures to a dangerous level, even causing the unit to become red-hot, making it a real danger if a flammable liquid comes in contact with it.
Common mistakes when diagnosing the P2200 codeCatalytic converters are designed to last the life cycle of the vehicle. Too often, technicians fail to investigate what caused catalytic converter failure in the first place. Engine misfires, excessively rich exhaust stream and O2 sensor failure can all degrade the platinum element of the catalytic converter. Also, remember that remanufactured or aftermarket catalytic converters are a bad bet and often don’t offer the performance or lifespan of an OEM-quality converter. Don’t forget to rule out codes related to oxygen sensors, fuel trim, fuel mixture or misfires before diagnosing/repairing an NOx sensor-related code. How serious is the P2200 code?A P2200 code can result in failed emissions testing, poor performance and the need to replace the catalytic converter. What repairs can fix the P2200 code?A P2200 code may require:
Like many other diagnostic codes, a P2200 code can be very tricky to diagnose and repair, and may be accompanied by other codes. It’s necessary to perform a proper process of elimination to avoid replacing parts unnecessarily while still not addressing the root problem. Need help with a P2200 code?YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230. Check Engine Light trouble codes P2200 How many NOx sensors does a 6.7 Powerstroke have?About NOx Sensors
The assembly uses two NOx sensors: the first sensor (referred to as NOx sensor 1) is located near the turbo downpipe and measures engine-out NOx. The second sensor (referred to as NOx sensor 2) measures NOx levels exiting the SCR catalyst.
What side is bank 1 sensor 2?For example, a DTC that reads “Bank 1 sensor 2” means that the O2 sensor is located on the same side as cylinder 1, after the catalytic converter. On the other hand, a DTC that reads “Bank 1 sensor 1”, means the O2 sensor is located before the catalytic converter, on the same side as cylinder 1.
Which NOx sensor is upstream?NOx Sensor for NOx aftertreatment system
The sensor located upstream of the SCR catalyst directly measures the engine-out NOx gas concentration, which helps determine the optimum amount of urea injection. The NOx sensor downstream of the SCR catalyst is used to monitor the performance of the catalyst.
Where is the downstream NOx sensor located?The downstream nitrogen oxide component is located behind the cab, you have to go under the truck, and you will see the SCR on the left with the exhaust coming out of it. The NOx levels sensor is located on the outlet side of the SCR and is almost immediately after the SCR.
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