TriX Loc: Raleigh, NC

Absolutely correct. Except for the inspection, that’s an excellent long term solution. 😺

TriX Loc: Raleigh, NC

👍👍

Plumma Loc: NE MA.

sorry double post

Plumma Loc: NE MA.

I have a Nissan Versa 2012. I had the same code. The car would only go 20 mph and the engine was very rough running. Replaced O2 sensor. after that it ran well for all of 27 miles then started doing the same thing. then I took it to the dealer. They had it for 2.5 months. the finally say it's the brake light senser. Seems that it is somehow connected to the transmission so the computer thought that there was something wrong with the transmission.
Just got it back yesterday and it is running like new. But I have only put 24 miles on it so we shall see?! The good part was the I got a loaner car for the full time and put 3000 miles on that:) I was hoping that they lost my Car.
Good luck with your car

carl hervol Loc: jacksonville florida

sound like a gas cap try changer the gas cap that what fix mine buy a factory cap not a after market

Amielee Loc: Eastern Washington State

I have an old Toyota Previa that I bought new. A few years ago the check engine light came on. I have replaced the O2 sensor twice, the Catallitic Converter once, the gas cap once and the check engine light still comes on. Pulling fuse # 15 turns it off. It does not set a hard code. After pulling the fuse the light may stay off for a few days or months. It has never failed an emissions check. Since I now only use the car to haul things to the dump or pick up lumber I am through replacing things. It took me a while to learn that I was paying mechanics to go to school on this car.

lARRY1 Loc: southern nc

Had the same problem with my daughter"s Honda. The mass air flow sensor has a very small probe in the center of the sensor and the only way to clean it is to spray a cleaner down the tube . Most of the time I have found this isn't much cleaning. If the build up is bad, the cleaner isn't going to help. Replace the mass air flow sensor, easy to do yourself, about $100 bucks. Clear codes. This fixed my problem. Good Luck!!

FRENCHY Loc: Stone Mountain , Ga

System too lean bank 1. Oxygen sensor. Could have up to 4 depending on the car.

If only one sensor it's easy, 2 or 4? the tech has to read and test it, that's where the problem starts, being paid on a flat rate most of the time, they replace both of them or more if equipped and the bill is up there.

kd7eir Loc: Tucson, AZ

Look for a vacuum leak on bank one of the engine - that will be the cheapest fix if that's the cause. Otherwise it could be any of the following:

A faulty fuel pressure regulator
A weak fuel pump
A clogged fuel filter
A faulty powertrain control module
A vacuum leak
Faulty injector(s)
Faulty oxygen sensor(s)
A faulty mass air flow sensor

burkphoto Loc: High Point, NC

Yes. Stay away from guessing dealers! Independent garages can be far better and less costly. Ask around in your community about good ones. I found two near me. The local Toyota dealer is a scam.

edrobinsonjr Loc: Boise, Idaho

I have experienced this when a vacuum hose split and leaked additional air into the system.

wideangle Loc: Wisconsin

I had an engine code in a 2005 honda pilot. replace the air filter and the hasn't come on for 3 weeks now

tropics68 Loc: Georgia

There are numerous possibilities for that code. This page lists some easier things to try before emptying your wallet at a dealer.

I had it on a Monte Carlo some years back and changed the oxygen sensors and it fixed the problem. I am not saying that is your problem just my one time experience.

http://www.myautorepairadvice.com/p0171.html

fiat124

hi. check that the o2 sensor is switching. on later cars the ecu wont let the engine run rich so it runs weak with no power. a branch of ngk make very very good replacement o2 sensors. i would not go for injectors to be cleaned. the o2 sensor nearest the head feeds ecu with info to control the fuel and the o2 sensor after the cat checks that the cat is working as it should

TriX Loc: Raleigh, NC

Good list. If it was mine, I’d do the following:

After making sure the fuel filter had been changed at the recommended intervals, i’d first go looking for a vacuum leak after the mass airflow sensor such as a cracked vacuum hose or the rubber boot from the mass airflow sensor to the intake manifold, etc. One way to check is to blow a little propane (from an unlit propane torch) around the various intake components and hoses. If the engine speeds up, you discovered a leak. If I didn’t find a leak, then my next step would be to see if the mixture is really lean, or the oxygen sensors are faulty. Some cars have one per exhaust, and some have two (before and after the catalytic converter). You can remove and check them statically with an ohmmeter if you can find the spec, but that’s no guarantee they’re actually good dynamically. If the sensor(s)’s good and the engine is actually lean, then there can be a number of causes, but probably the mass airflow sensor would be the first candidate, since these fail fairly regularly. Also look for loose/damaged electrical connectors to the mass airflow and water temp sensors, etc. A more sophisticated code reader or one for your specific car may be able to diagnose this very quickly with something more specific than this general code, and that diagnosis, if available, would be money well spent.