Here are the most common ones. The vehicle service manual should be consulted for more information on possible causes of the fault, along with required testing. You should also check that the spark plug gap is set properly. The code happens when the fuel mixture is to rich. P0121 is a somewhat common trouble code with the Pontiac G6.
A scan tool that can read live data is required to watch the voltages on the O2 sensors to determine if one has failed or is running out of range. Now don't ask yourself; What should you do with P0171 code? Also, look for black soot at any point in the system as this can indicate an exhaust leak. Lean is higher oxygen and lower fuel. Just replaced plugs and wires and new rotors and brakes, along with new thermostat. It even idles rough too when I do this. To inspect for an exhaust leak, have a helper start the engine and hold the idle at about 1500 rpm, listen for additional exhaust noises coming from the system including.
Tech notes If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. Please or to join the conversation. Step by step guide on how to repair automobile lean code problems, this article pertains to most vehicles. This can quiet a noisy injector. They actually share data from several sensors and inputs, but we are going to talk about your wheel speed sensor data for a minute. It also throws the code P0171 to let you know that it has done this. Regardless of how you approach it, you should get this fixed right away.
If your spark plugs look good, problems with your ignition system can also preventing a spark. I hope I haven't bored you too much with the details. A leaking intake could cause that lean condition. This will cause the G6 to run rich. I will be one happy camper but don't want to get my hopes up. However, an oxygen sensor is easy to replace on many cars and is usually detailed in the owner's manual. I will be one happy camper but don't want to get my hopes up.
Fuel delivery is controlled differently during Open Loop and Closed Loop. The engine fuel management system is controlled by the computer and various sensors which feedback data. The engine control computer can shut the fuel and ignition off to reduce the torque on the drive wheels in an effort to regain control. Consult your service manual for it's location if you need help. You should still be able to drive a car that's running too lean, but you should never, under any circumstances drive it fast or put it under heavy load.
If there is anything that you would like to add, please leave a comment below. The filter is located under the rear of the vehicle by the fuel tank, if this doesn't help run, or have run a fuel pressure check to determine if that is the cause. Please or to join the conversation. Please or to join the conversation. This can be verified by scanning your computer system. The melting is under extreme conditions.
Vacuum Leak Testing Step 4 - An exhaust leak will allow fresh air to enter the system on the negative pressure side of an exhaust event, this will cause an to produce a lean reading. Take a look around and see if you can find the vacuum leak. . Question: Check Engine light on. It is relatively serious problem since it leaves your vehicle in failsafe mode. Therefore, an engine must be running properly without to avoid lean mixture codes.
Any help would be appreciated. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. This youtube video is a great resource for diagnosing the P0171 trouble code in your G6. A leaking intake could cause that lean condition. If your front tires are over worn, it can act up under hard braking and give the steering wheel a good shake.