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P0400

Code P0400 (https://www.yourmechanic.com/article/p0400-obd-ii-trouble-code-exhaust-gas-recirculation-flow-malfunction-by-jay-safford) does not necessarily mean that there is something wrong with the EGR valve itself. The only way to condemn the EGR valve is to directly test it. In particular Code P0400 includes a circumstance where the EGR...

Diagnostic Trouble Code P0400 (https://www.yourmechanic.com/article/p0400-obd-ii-trouble-code-exhaust-gas-recirculation-flow-malfunction-by-jay-safford) can set if the EGR valve is faulty but other causes for code are a break in the vacuum line to the EGR valve, a faulty EGR temperature sensor, or carbon deposits and blockages in...

Some of these vacuum-operated EGR systems that your vehicle has can be a little tricky. There are a few different solenoids, and they can be hard to isolate and test to find the bad component. In addition to the solenoids,...

Hi there. Check the Exhaust Gas Recirculation (https://www.yourmechanic.com/services/exhaust-gas-recirculation-egr-valve-replacement) valve on the engine. It seems to be sticking on when the engine is running at low idle and causing a misfire as the old exhaust that is burnt is reentering the...

Hey there. The codes you have downloaded simply relate to malfunctions in the "engine management system." It appears codes were set for oxygen sensor (https://www.yourmechanic.com/services/oxygen-sensor-replacement) voltage out-of-range, possible EGR (exhaust gas recirculation) problems such as a blockage, and a generic...