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stelol1
stelol1, ASE Certified Technician
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P0172 system too rich bank 1 code on Opel/ Vaxhall Astra H

Resolved Question:

P0172 system too rich bank 1 code on Opel/ Vaxhall Astra H 1.6 sport. Coil pack changed and Air mass meter changed, Both brand new. Burning 1L oil every 1000km roughly. Is it the Lambda Sensor? And if so which one? Thanls in advance Gerard.
Submitted: 2 years ago.
Category: Car
Expert:  stelol1 replied 2 years ago.

stelol1 :

Hi Gerard, The code that you have relates to the lambda sensor detecting that there is a lack of oxygen in the exhaust (A lambda sensor detects oxygen content) No oxygen = Rich, Lots of oxygen = Lean. The engine will naturally fluctuate between rich and lean as the fuel system adjusts itself but over time alternating between rich and lean will equal and average of just right. You sensor is detecting rich all the time, normally not a lambda fault. It is only reading what it sees, however you are burning an excessive amount of oil that will expel into the exhaust as it is burnt and clog the sensor up. You need firstly to resolve the excessive oil consumption and clean or replace the lambda sensor if it doesn't clean. Then you can work on trying to resolve why the fuel system is constantly rich. An engine temp sensor fault will cause excessive fuelling if it has been reading that the engine is cold constantly. But you really need to sort the oil and dirty lambda before you go looking for any faults as these will give you false results.

stelol1 :

I hope this makes sense and helps. If not or you wish to ask more questions then please feel free to do so until you are happy.

stelol1 :

Regards

stelol1 :

Steve

stelol1 :

Forgot to say that bank 1 is before the cat and bank 2 is after the cat.

stelol1, ASE Certified Technician
Category: Car
Satisfied Customers: 47
Experience: .
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Expert:  stelol1 replied 2 years ago.
Hi,
Thank you for contacting Just Answer and your support in providing positive feedback.
Kindest regards
Steve

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