Repeated PO171 Lean Code:2008 Pontiac Vibe

Install new spark plugs, 4 new coils & replace the oxygen sensors

O2 Sensors are only good for 100,000 miles, then slow
down or quite

No idea why the coils do not last 5 or 6 years

Cylinder #1 is always at the front on a 4 cyl

Go to Rock Auto --Buy Wells Coils,NGK Double
Platinum Plugs & NTK O2 Sensor

Those parts are expensive because you have a Totota
Motor I guess

Clean MAF Sensor with CRC MAF Sensor Cleaner

Depending on what the actual code is, it could be a faulty O2 sensor or a fuel pressure problem among other things.

A p0442 code is solved by replacing the gas cap in most cases, especially if it is the original gas cap. As for the p0771 lean code, there are many issues that can cause this code, O2 sensor, small exhaust leak, spark plug or fuel injector issue, spark issue...the list goes on. This code will need a good understanding with diagnostic procedure and testing and a scan tool would help. You may get lucky with replacing the spark plugs and checking for an exhaust leak and repair the exhaust. A scanner will allow you to see what the engine management components are doing while the engine is running. Keep in mind, it may take several good trips to turn the check engine light off after repairs are made and codes are erased.

The light may come back, if your code was saying that engine was running lean which i think is a po171 this is a very common problem and will only happen mostly in cold weather, the problem is the intake manifold gasket, this is very common i have done a few, the part , the gasket is 9.00 and it takes about an hour to replace so if the light comes back check the gasket, good luck,

you need to have your computer cleared of all errors after the problem has being resolved. this can only be done with a scan tool. until this is done ur car may still run poorley

Not sure that the O2 sensor was bad. It sounds like it was telling you that side of the exhaust system was picking up a lean mixure at the O2 sensor. The O2 sensor was doing its job by telling you the mixture changed. If the O2 sensor was bad, it would say low voltage range for that sensor, or open curcuit.
Now the car has had time to do its diagnostic sweep, it is telling you the same thing, but from a different sensor...the fuel mix is too lean. Air/spark/and fuel is what you need in the correct amounts. In your car, the ECM engine control module controls this by taking readings from all the sensors several hundred times a second.
Mechanically, you have a few options. Change the fuel filter...under the car on the passenger side. It is an easy job.
Change the fuel pressure regulator. This keeps the fuel at 4 BAR so the fuel injectors can do their job correctly. This job just needs a screw driver to pop off the clip that holds it in place. No hoses need to be removed. It is on top of the intake manifold, in-line with a metal fuel line and a rubber one.
The fuel injectors could be clogged up on one side of the engine. Run some fuel injector cleaner through a tank of gas. Also, listen for a constant ticking sound at each injector. If one sounds off PAR, then replace it.
The fuel pump may not be giving you enough power. However, the readings seem to be localized to one side, so I doubt it.
Start with the easiest thing, and see if it works. Also, you will need to get yourself a VAG scan tool. It is the only one with codes in it for all of your VW systems, not just engine codes like the ODB scanners. You can get a nice one for $50 on-line.
Good Luck!

ur o2 sensor is detecting a lean condition bank 1check ur maf sensor may be dirty or replacement try cleaning it with an electronics spray or brake spray cleaner --also check pvc lines and vacuum lines --not often but the fuel filer can also set this code off check fuel pressure

Basically the mechanic will make sure don't need a tune up. or have vacuum issues or leakes in the exhaust before the cat. Then he should check the front 02 sensor to make sure its not getting lazy. If all this passes then you will need a new cat. If the O2 sensor has more than 70,000 miles on it it needs to be replaced anyways so you may just want to do this first and hope the light stays off.. The problem with a lean code is you will wear out the cat real fast if you didnt deal with this and kept driving the car. The lean code could have been vacuum leak or a bad MAF sensor or weak fuel pump.

P0171 - Fuel Trim System Lean Bank 1
YOU WILL NEED TO AVE THE DEALER TEST THE O2 SENSOR FOR PROPER SWITCHING, RIGHT NOW IT SHOWS ALWAYS LEAN, THIS MAY BE THE SENSOR OR THE ENGINE MAY REALLY BE LEAN ON FUEL AIR RATIO, AS FAR AS THE SMOKE GOES THE 2 ARE PROBABLY NOT RELATED, HOW MANY MILES ON CAR? IF THE MILES ARE HIGH THEN REPLACE THE O2 SENSOR ON THE CYLINDER BANK WHERE # 1 CYLINDER IS LOCATED, THE SENSOR IS THE ONE BEFORE THE CATALYTIC CONVERTER.

code po316 is a random misfire like plugs or wires po171 will cause po316 po171 is a lean o2 code on bank # 1 that is a vacuum leak need to check it better for a vac leak