Saiou 3 still has fault light after EGR valve replacement
4 Answers
Saiou 3 experiencing this situation indicates an engine fault warning light, reminding the driver to visit a repair shop as soon as possible. Minor issues may include failing emission standards and unstable idling, while severe cases could affect vehicle performance. More details are as follows: 1. Sensor signal: The PCM monitors the input from the EGR valve pivot position sensor signal to ensure the valve responds correctly to PCM commands. When the EGR valve feedback signal voltage exceeds 0.2V for more than 20 seconds, the PCM will store fault information and illuminate the engine fault warning light. 2. Sticking or open circuit: Carbon deposits between the valve and valve port alter the pivot position, causing changes in the pivot position sensor's resistance value. When the PCM detects a discrepancy between the actual pivot position signal voltage and the set value, it will illuminate the fault warning light.
After all these years of repairing cars, I've seen many cases where the check engine light stays on after replacing the EGR valve on Sail 3 models. The most common issue is poor quality of the new EGR valve itself - some aftermarket parts cause problems immediately after installation, or the connector wasn't properly secured during installation, preventing signal transmission to the ECU. Additionally, the EGR system connects to other components like the intake pressure sensor or vacuum lines - if these have leaks or damage, the light will remain on. Another possibility is that the trouble codes weren't completely cleared, so the ECU still thinks there's a problem. I recommend finding a reliable repair shop to read the specific trouble codes with a diagnostic tool rather than trying to fix it yourself blindly. If the EGR system isn't properly functioning, it can affect engine combustion, increase fuel consumption, and even damage the catalytic converter, impacting emissions and annual inspections. Safety first - don't wait until serious problems occur to regret it.
As an experienced driver, I've been driving a Sail 3 for several years and have encountered similar issues. Even after replacing the EGR valve, the light remains on, likely due to aging wiring or loose connectors, especially in older vehicles where wires are prone to wear. A friend of mine faced the same situation—he replaced the valve but didn’t check the sensor, and the light kept flashing. It turned out the oxygen sensor was faulty. Don’t rush to replace parts; first, inspect the fuse box or check for rust on the ground wires. The EGR system controls exhaust gas recirculation, and if not properly repaired, the engine may shake or lose power. I recommend taking your car to a professional shop for a comprehensive diagnosis—they can quickly pinpoint the issue. Regular maintenance, like cleaning the intake tract, can help prevent such problems.
I just dealt with the EGR issue on a Sail 3. After replacing the valve, the light is still on, possibly due to improper installation or uncleared fault codes. First, check if the EGR valve connector is securely plugged in, then disconnect the battery for a few minutes to reset the computer. If the light goes off, it indicates a false alarm; if it remains on, it might be due to faulty related sensors like the MAP or temperature probe. Problems with the EGR system can lead to excessive emissions and increased repair costs. It's recommended to use an OBD tool to read the codes and not delay the fix.
