Ox sensor needs to be replaced
Change the primary oxygen sensor on the number one cylinder bank. Whichever bank has cylinder number one, is bank one. The primary sensor is the one between the engine and the catalytic converter on that side. There's a secondary sensor behind the catalytic converter, but the primary (pre-cat) sensor is the one used for determining fuel mixture.
SOURCE: OBD II DTC P0172
p0172 is not a volvo code so may not be correct but converted to volvo is code 250a long term fuel upper limit (lean vac leak) ck all vac hoses and replace the canister purge valve mounted on the radiator (about $40.00 part) then reset all codes
SOURCE: Want to know what PO172 System too rich bank 1
it means your cars computer is pumping too muchgas into your motor because it thinks the engine is either running lean possibly due to faulty o2 sensors or that the coolant temp sensor is giving false readings and the ecm thinks the car is still too cold.
SOURCE: 2000 ford taurus bank 1 and bank 2 running rich
it sounds like the O2 sensors need replaced. bank 1 is the left side and bank 2 the right
SOURCE: 3 codes present on my 2002 Envoy. p0172, p0420, and p0340,
Track the p0340 first camshaft timing is very important and could possibly cayse your other codes,Call your local GMC dealer I think I remember a bulletin about this code.
SOURCE: Diagnostic failed code reads PO172B Fuel Trim
Basically this means that an oxygen sensor in banks 1 and 2 detected a rich condition (too little oxygen in the exhaust).
A code P0172 may mean that one or more of the following has happened:
· The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters can cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
· There could be a vacuum leak
· There could be a fuel pressure or delivery problem
Possible solutions include:
Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
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