Egr fault code P040100

[Pwm]

Hi. Replaced egr valve after getting engine management light on and fault code p040100 coming up on code reader. After changing egr reset code and engine management light went out then came back on after few days.Plugged code reader in and fault code p040100 was back up. After a bit of research online replaced the dpf sensor as heard this could cause the fault code. Again reset the code and was fine for couple days but fault code is back again and engine management light is back on.Anyone got any ideas. 
 

Thanks 

Paul 

[evopilot]

the fault is in relation to lack of air flow detects at the EGR so if you have replaced the EGR itself id be taking off and cleaning the pipework as far upstream and downstream as possible from the EGR

[Pwm]

Yip done all that when EGR was changed wasn’t to bad to be honest. Think the next idea would be to check for any vacuum leaks, have you had any known issues with a vacuum leak at certain places as it could be a good point to start where people have had issues before. 
 

Thanks

paul 

[Stevey Y]

On 2/22/2022 at 10:12 PM, Pwm said:

Hi. Replaced egr valve after getting engine management light on and fault code p040100 coming up on code reader. After changing egr reset code and engine management light went out then came back on after few days.Plugged code reader in and fault code p040100 was back up. After a bit of research online replaced the dpf sensor as heard this could cause the fault code. Again reset the code and was fine for couple days but fault code is back again and engine management light is back on.Anyone got any ideas. 
 

Thanks 

Paul 

Hi did you readapt the new EGR and sensor as this would cause the fault to re surface as the ECU only has the old adaptation values stored, when readapting is in place the ECU learns the new values as it goes along the drive cycles and absorbed those as the new operating parameters.

Steve.

 

[Pwm]

Hi stevey. Had it checked out at a garage today and they have said it’s a faulty EGR valve so they are going to fit new one tomorrow so hopefully it cures the problem. 
 

thanks

paul 

[Stevey Y]

18 hours ago, Pwm said:

Hi stevey. Had it checked out at a garage today and they have said it’s a faulty EGR valve so they are going to fit new one tomorrow so hopefully it cures the problem. 
 

thanks

paul 

Hi Paul thats a bit of savage luck, I have come across a few new wrong-un EGRs in my time mostly from Eurocarparts and some Valeo units known as the French revenge, I hope the new one has solved the problem.

Steve.

[Milan punak]

Egr P040100  code cleaned change breath pipe but engine light came on next day can anyone help pls the car pulls good drives good don't understand