Help needed, code p0171 P0174

[savagenoize]

again, many thanks for your efforts and time Zephyr, its much appreciated.

 

[savagenoize]

I think I may have stumbled across something significant - this isn’t right is it - o2 sensors downstream at tick over
View attachment 256133

 

[savagenoize]

 

[Zephyr]

imho - air leak - bad sensor - bad maf.
99% is a number the ecu just ignores and never takes into account. This is way way off.

 

[NZ00Z3]

Time to look on the other side of the engine. An exhaust leak before the pre-cat O2 sensors will cause a lean code condition.

Check the SAP system.
- Hole in rubber hose from the air pump?
- Faulty metal valve?

Read: https://www.e46fanatics.com/threads...how-to-diagnose-p0171-p0174-and-more.1284608/

 

[Zephyr]

Any progress on this? Very curious to see what this actually was.

 

[savagenoize]

Not yet, busy elsewhere at the moment, will be coming back to it soon