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P0402

P0402 (https://www.yourmechanic.com/article/p0402-obd-ii-trouble-code-exhaust-gas-recirculation-flow-excessive-detected-by-jay-safford) means the exhaust gas recirculation (EGR) valve is flowing too much recirculated exhaust gas when it is commanded to open the flow of exhaust gas into the intake manifold. A consequence is the engine could be running rough...

Hi there. Check the fuel system and see if the fuel injector for cylinder number 2 is malfunctioning. The code P0402 (https://www.yourmechanic.com/article/p0402-obd-ii-trouble-code-exhaust-gas-recirculation-flow-excessive-detected-by-jay-safford) means that the EGR is not functioning and the code P0174 (https://www.yourmechanic.com/article/p0174-obd-ii-trouble-code-system-too-lean-bank-2-by-blake-griffin) means that Bank 2 is lean,...

I'm working on it.

Hi there - while a cracked exhaust tube of any sort is a problem that needs to be addressed, I don't think it's related to your P0402 code. P0402 (https://www.yourmechanic.com/question/how-to-fix-or-figure-out-exhaust-system-leak-code-p0402-by-mushtaq-m) indicates excess exhaust flow into the intake - probably caused...

Hi there. The Engine Gas Recirculation (EGR) valve could be sticking or full of deposits from the exhaust system. Remove and clean the EGR valve before replacing it to see if the system will begin to operate. The oxygen sensors...

The first code, P0171 (https://www.yourmechanic.com/article/p0171-obd-ii-trouble-code-system-too-lean-bank-1-by-andrew-quinn), is an indication the engine is running lean. This code can indicate anything from clogged air and fuel filters to problems with O2 sensors and mass air flow sensors to intake gaskets. The other code,...