Po171 and174 error codes turning on after 80km always at idle in traffic

[Julian white]

Any idea what’s causing error codes- tried cleaning maf and checking vacuum  leaks with butane burner , appreciate some advice. Both codes come on after about 90km  km and always at idle ( in traffic)- even if it’s not heavy traffic like the states or Europe/ it is New Zealand!

[Loren]

 

It is always helpful if you give us the exact model and year of your car.

[Julian white]

Sorry beginner ! it’s 996 2002 turbo done 100,000 km 

[wross996TT]

Oxygen Sensing Adaptation, Idle Range, Bank 1& 2 Above Limit

 

Possible fault cause

♦ Incorrect signal from MAF sensor

♦ Intake air system leaking

♦ Fuel pressure too low

♦ Volume supply of fuel pump too low

♦ Fuel injectors fouled

♦ PCV valve leaks

♦ Cap of oil filler neck not closed correctly or seal is damaged

 

Cleaning the MAF may or may not work.  You can try running without the MAF (though this will throw other codes) to see if it comes back.  O2 sensors could be bad or there could be connection problems (though not sure why both went at the same time?). Check your fuel pressure. Exhaust system leaks.  Fuel injectors fouled.  When was your last service and what was done?

[Julian white]

Service was only done 2000km ago 3months ago.car  seems to idle normally when cold but a bit fast maybe 1100 rpm when warm , that’s the only think I notice, it’s running otherwise fine