Hi guys, from the title you can see that I have problem with the EGR valve.
I have a mazda 6 from 2004, diesel, with 2000cc engine.
I took my car to the service twice already to clean the valve, but after 2-3 days from cleaning, the errror code reappeares with the check engine light.

Do you have any of you ideas what to do? Or in the worst case i have to replace it with new one? Or there is something much worse in the background?

Thanks forward for your answers!

MAZDA is the best

 

What fault codes are you getting?

 

I dont remember exactly what code is , but iam getting only one fault code and at the service i was told that is related to the EGR valve .

 

Hi I finally bought ELM 372 diagnose tool.
With it i could read the error codes and that is P0401 and P0402.
Insufficient flow if iam correct.

Any suggestions what could be the cause?
I already cleaned the EGR valve.

 

P0401 : EGR flow insufficient detected

Possible causes,
• EGR valve malfunction
• Intake shutter valve malfunction
• Boost sensor malfunction
• EGR gasket malfunction
• PCM malfunction

P0402 : EGR flow excessive detected

Possible causes,
• Intake shutter valve malfunction
• EGR valve malfunction
• PCM malfunction


When we use the IDS/MMDS ( Mazda's diagnostic software ) at work we can monitor multiple PIDS ( Parameter Information Display ??? )
We can switch the EGR valve on & off, or the Intake shutter valve on & off electronically & monitor multiple sensor outputs. This helps pinpoint problems without swapping out parts.