When to set the trouble code p0402?
Code P0402 is often set when the EGR monitoring criteria are excessively triggered—triggers include too much Manifold Pressure change, too much Oxygen sensor change, and too much EGR Temperature change.
Why is the P0420 code stored in the engine control unit?
If the rear O2 sensor is getting faulty values, the p0420 code will get stored in the engine control unit. It could be because the catalytic converter is defective, or a false alarm because one of the O2 sensors is damaged.
What does it mean when EGR code is p0402?
When the computer sets a code P0402, it means that the EGR flow monitoring criteria has not been met. The EGR monitoring criteria are a set of test values and are usually run during at least two different driving conditions—steady speed freeway driving and steady speed city driving. The test criteria during EGR operation include:
What does P0420 mean on a catalytic converter?
P0420 means that the efficiency of the catalytic converter is below the threshold. The ECM uses two O2 sensors, one in the front and one in the back of the catalytic converter to measure the efficiency. If the efficiency is low, the P0420 code will be triggered.
What does the code p0402 mean on an engine?
P0402 is an OBD-II generic code that the engine control module (ECM) has detected indicating the engine exhaust gas recirculation (EGR) valve is flowing too much recirculated exhaust gases when it is commanded to open the flow of gases into the intake manifold.
Where is the P0420 OBD2 trouble code stored?
The front O2 sensor measures the mixture, and it tells the engine control unit if the engine is running with a rich or lean mixture and adjusts it. The rear O2 sensor is just a diagnostic O2 sensor for this trouble code. If the rear O2 sensor is getting faulty values, the p0420 code will get stored in the engine control unit.
What causes the O2 sensor to show the code po420?
Rich or lean mixtures can damage the catalytic converter, and when the catalytic converter is damaged/filled with fuel, the efficiency will be low, and the rear O2 sensor will see that and show the trigger the code Po420.
Can a damaged catalytic converter trigger the code po420?
Yes, they can, but not in the way you think. Rich or lean mixtures can damage the catalytic converter, and when the catalytic converter is damaged/filled with fuel, the efficiency will be low, and the rear O2 sensor will see that and show the trigger the code Po420.
Code P0402 is often set when the EGR monitoring criteria are excessively triggered—triggers include too much Manifold Pressure change, too much Oxygen sensor change, and too much EGR Temperature change.
What’s the difference between p0401 and P0 402?
Whereas a P0401 means there is too little exhaust gas recirculation (EGR) happening, a P0402 means there is too much. This results in an overly-rich mixture of oxygen in the fuel/air mix and – as a result – higher engine temperatures.
What is the p0402 code on a Ford F-150?
It’s important to note that code P0402 is often set in Ford vehicles (especially on a Ford F-150) that use a differential pressure feedback EGR (DPFE) sensor to determine how much EGR is flowing. Aside from Ford, users have also reported P0402 in Toyota, Nissan, Peugeot, and Lexus vehicles.
When the computer sets a code P0402, it means that the EGR flow monitoring criteria has not been met. The EGR monitoring criteria are a set of test values and are usually run during at least two different driving conditions—steady speed freeway driving and steady speed city driving. The test criteria during EGR operation include: