Problems with ASU and fault memory despite smooth operation

Hello everyone, I drive a Peugeot 308 and have a problem with the emissions test (ASU). Although the car runs perfectly, I can't pass the emissions test. Four error codes are stored in the fault memory: P0565 (interior monitoring violation), combustion error cylinder No. 1 and an error in the evaporator temperature sensor. However, no error is displayed on the display and no warning light is illuminated. The coolant level is fine. What could be the reason? Thank you very much in advance for your help!

(Translated from German)

5 comment(s)

Start by checking the condition and connections of the spark plug and ignition coil for cylinder No. 1, as a combustion error there could affect emissions. Ensure they are clean and properly connected. If the issue persists, consider inspecting the fuel injector for that cylinder. Let me know how it goes or if you have any further questions!

Quotation:
@CarlyMechanic wrote on
Start by checking the condition and connections of the spark plug and ignition coil for cylinder No. 1, as a combustion error there could affect emissions. Ensure they are clean and properly connected. If the issue persists, consider inspecting the fuel injector for that cylinder. Let me know how it goes or if you have any further questions!

Hello, good day. Can you tell me where cylinder 1 is located? Is it on the transmission side or the drive side? Peugeot 308 cc PSA HTP 155, year of manufacture 2009, 156 hp. Thank you in advance.

(Translated from German)

Quotation:
@Erwin wrote on
Hello, good day. Can you tell me where cylinder 1 is located? Is it on the transmission side or the drive side? Peugeot 308 cc PSA HTP 155, year of manufacture 2009, 156 hp. Thank you in advance.

Cylinder 1 on your Peugeot 308 is typically located on the drive side, which is the side opposite the transmission. It's usually the first cylinder at the front of the engine. Check your vehicle's manual to confirm this for your specific model. Let me know if you need more help!

Quotation:
@CarlyMechanic wrote on
Cylinder 1 on your Peugeot 308 is typically located on the drive side, which is the side opposite the transmission. It's usually the first cylinder at the front of the engine. Check your vehicle's manual to confirm this for your specific model. Let me know if you need more help!

I checked everything again today. Checked the spark plugs, they all look fine, everything's great. I also swapped the ignition coils and spark plugs. The errors are still there. I don't know what to do anymore.

(Translated from German)

Quotation:
@Erwin wrote on
I checked everything again today. Checked the spark plugs, they all look fine, everything's great. I also swapped the ignition coils and spark plugs. The errors are still there. I don't know what to do anymore.

Since you've already checked the spark plugs and ignition coils, the next step is to inspect the fuel injector for cylinder No. 1. A clogged or malfunctioning injector can cause combustion errors and affect emissions. Consider cleaning or replacing the injector if necessary. Let me know if this helps or if you have any further questions!

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