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What does engine code P0403 on 2002 dodge stratus mean?

P0403 on a 2002 Dodge Stratus indicates a Exhaust Gas Recirculation (EGR) flow insufficient problem. This means the engine's computer has detected that not enough exhaust gas is being recirculated back into the intake.

There are several possible causes for this code, including:

* EGR Valve Stuck Closed: The most common cause. The valve might be physically stuck, or there could be a problem with the valve's solenoid.

* Vacuum Leaks: Leaks in the vacuum lines connected to the EGR valve can prevent it from functioning correctly.

* Clogged EGR Valve: Carbon buildup can restrict the flow of exhaust gas.

* Clogged EGR passages: The passages in the intake manifold or exhaust system where the EGR gas flows can become blocked.

* Faulty EGR Position Sensor: The sensor might be malfunctioning, providing incorrect readings to the engine computer.

* DPFE Sensor (Differential Pressure Feedback Sensor) Problems: This sensor measures the pressure difference across the EGR valve. A malfunctioning DPFE sensor can cause a P0403 code. (This is especially common on the 2.4L engine often found in the Stratus.)

* Wiring or connector issues: Damaged wiring or connectors related to the EGR system can also trigger the code.

You'll need to diagnose the specific cause. This often involves a mechanic using a scan tool to check sensor readings and performing tests to pinpoint the problem. Simply replacing the EGR valve isn't always the solution; the underlying issue might be something else, like a vacuum leak or a clogged passage.

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