What does P0171 system Too Lean Bank 2 mean?
P0171 is triggered by the engine bank 1 “upstream” oxygen sensor and P0174 is triggered by the engine bank 2 “upstream” oxygen sensor. The oxygen sensor alerts your system when the condition is too lean meaning there’s too much oxygen in the exhaust.
Can a bad o2 sensor cause a P0171?
Additional Causes of Code P0171 A plugged Fuel Filter or poorly functioning Fuel Pump can set the P0171 code. The computer hears (accurately) from the Oxygen Sensor that the Fuel Mixture is too lean so the computer keeps increasing the amount of fuel being delivered into the combustion chambers.
How do I fix code P0171 and P0174?
If your computer logged both P0171 and P0174 codes, concentrate on those components affecting all cylinders, like a MAF sensor, a clogged fuel filter, or issues with a fuel pressure regulator. Otherwise, concentrate on the side of the engine represented by your diagnostic trouble code.
How much does it cost to fix P0171?
Perhaps your P0171 OBD-II Trouble Code: System Too Lean Bank 1 trouble code is appearing because it is due to you needing to replace your fuel injector/injectors. Generally, a fuel injector replacement cost will between $800 and $1,450 for a full replacement.
Can a bad fuel pump cause P0171?
A leak that causes diagnostic trouble code P0171 could be anywhere around the engine intake, including the PCV hoses, vacuum hoses, and the intake manifold gasket. A weak or failing fuel pump won’t push enough gasoline to the engine. Clogged fuel injectors or a dirty fuel filter will cause a similar backup.
What to do if your Subaru has a p0171 code?
If there are no intake leaks, the next step is to replace the air filter and clean the air flow meter. If the problem persists the front oxygen (O2) sensor may need to be replaced. The cost to diagnose the P0171 SUBARU code is 1.0 hour of labor.
What to do if your air filter is p0171?
Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins. If the P0171 is combined with the P0174 code, it’s very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replace the air filter and clean the air flow meter.
What makes the p0171 system Lean Bank 1?
Got the ap out checked to the code it came up P0171 system to lean bank 1. So I cleaned the maf sensor and continued to check it out. I found the hose clamp on the air duct hose that connects the ic to the tb was really loose and the back worked its self off a little. Fixed that and cleared out the code with the ap.
Why do I get p0171 on my ECU?
ECU seems to be correcting A/F by adding 25% extra fuel to make up for the system being lean. I’m no longer getting a MAF error after cleaning it but still getting P0171.