How to fix the P0402 trouble code in Jiangling vehicles?
3 Answers
P0402 trouble code: Exhaust Gas Recirculation (EGR) Valve A has detected excessive flow. Perform a thorough cleaning of the EGR system to ensure the EGR needle valve regains mobility and operates smoothly. Taking the Jiangling Ford Territory as an example, it is a joint-venture model, a compact SUV jointly produced by American Ford and Jiangling Motors. Below are the advantages of the Territory: 1. Spacious interior: The Ford Territory measures 4580*1936*1674mm in length, width, and height, with a wheelbase of 2716mm. Its elongated body ensures ample cabin space, complemented by wide and thick seats, further enhancing comfort. 2. High aesthetic appeal: The Ford Territory features a robust and full-bodied design. Its front fascia includes a polygonal grille paired with a dot-matrix honeycomb black mesh, seamlessly integrated with the headlights on both sides, which visually widens the vehicle.
I've repaired many Jiangling vehicles with the P0402 trouble code before, which indicates excessive flow in the EGR system. The most common issue is carbon buildup causing the EGR valve to stick, leading to excessive exhaust gas recirculation. I usually recommend owners to first remove the valve, spray dedicated cleaner on the carbon deposits, clean thoroughly, and reinstall it for testing. If the problem persists, check for leaks or aging cracks in the vacuum lines, and ensure the sensor wiring isn't loose or disconnected. Sometimes severe carbon buildup renders the valve irreparable, requiring replacement - the part costs just around a hundred yuan. Don't forget to clear the trouble code with a diagnostic tool afterward, otherwise the dashboard warning light will remain annoyingly lit. After repair, the engine runs smoother and fuel consumption may decrease slightly, but remember to disconnect the battery during operation to prevent short circuits.
I also encountered the P0402 issue with my own Jiangling pickup truck and learned a money-saving DIY method from the forum. P0402 indicates excessive EGR flow, most likely due to carbon buildup blocking the valve. I bought a can of carbon cleaning spray for just over twenty yuan, disassembled the valve, carefully scrubbed it, and reinstalled it—the fault disappeared. I also took the opportunity to check the wiring connectors to ensure there was no oxidation or looseness. The whole process took less than an hour, saving me the high cost of a dealership visit. It’s important to regularly inspect the vacuum hoses, as older Jiangling models are prone to hose aging and cracking, which can cause EGR malfunctions. Using high-quality fuel during daily driving can also help reduce carbon buildup.
