What does NOx catalyst efficiency below threshold mean?

What does NOx catalyst efficiency below threshold mean?

When a P20EE is stored in a diesel powered, OBD-II equipped vehicle, it means that the powertrain control module has detected that catalyst efficiency is below threshold for a certain engine bank. This particular code applies to the downstream catalytic converter (or NOx trap) for engine bank one.

How do I fix code P20EE?

What repairs can fix the code?

1. Replacing DEF Fluid.
2. Replacing NOx Sensor.
3. Replacing DPF Filter Element.
4. Replacing harness related to the SCR system.
5. Replacing a damaged or clogged SCR Catalyst.
6. Replacing corroded or cracked terminals.
7. Replacing damaged or misfiring injectors.
8. Installation of a Turbocharger Boost Sensor.

What is a P20EE dodge code?

P20EE is most often for injector nozzle blocked at SCR entry , under the truck .

How does a nitrogen oxide sensor work?

Many NOx sensors work by first removing oxygen and then breaking down the nitrogen oxides to provide a reading. However, the NexTech sensor eliminates the need to remove oxygen; the sensor material is engineered to have a strong NOx sensitivity even in the presence of oxygen.

What causes P20EE?

Diagnostic trouble code (DTC) P20EE stands for “SCR NOx Catalyst Efficiency Below Threshold.” This code is logged when the powertrain control module (PCM) detects that catalyst efficiency is below the threshold on bank 1. Code P20EE refers to the selective catalytic reduction catalyst (SCR) on a diesel engine.

Can an SCR catalyst be cleaned?

SCR catalyst systems need to be cleaned to remove contaminants and plugs. If the catalyst is not kept clean and the ammonia injection system is not tuned, ammonia slip occurs.

How do you troubleshoot an SCR?

Procedure to Test the SCR with the help of Ohmmeter:

1. To test the SCR, connect the positive output lead of the ohmmeter to the anode and the negative lead to the cathode.
2. The ohmmeter should indicate no continuity.
3. Touch the gate of the SCR to the anode.
4. The ohmmeter should indicate continuity through the SCR.

Can a NOx sensor be repaired?

The NOx sensor is a very complicated component and can be expensive to repair however, it’s often not actually the sensor which is causing the problem but the lambda probe inside the exhaust which tests the NOx levels which has malfunctioned, and this is something which can easily be replaced.

Can you drive a car with a faulty NOx sensor?

Of course, you can drive with a bad Nox sensor. However, I do not recommend it. Driving with a faulty Nox sensor for an extended period will cause several drivability issues. It may cause poor engine power output, erratic idling, sudden engine misfire, and bad gas mileage.