Inspect all engine and accessory vacuum lines to look for missing, torn or dilapidated lines and replace as needed. Based on my experience, the mass air flow sensing element gets dirty because of a dirty air filter that has not been serviced or replaced regularly. There are several possible issues that you need to address. Oh well hope it helps!! After he failed to fix it for two times, instead he replaced O2 sensor according to the repair manual. Technical Tip: While watching the fuel trims on your scanner, engine fully warmed up, step on the brake pedal.
After 10 mins it was all done and wow the brakes do work better! I didn't see the post, but the O2 is not in the loop for starting, it doesn't even do anything until the motor warms up and goes into closed loop. Really not too familiar with what the live O2 sensors should read. Vacuum leaks can be detected with a light spray around intake and vacuum fittings with carb cleaner. Please follow this link to troubleshoot the problem, engine misfires If your engine is running ok proceed to the next step. Electronics that are made with these older parts my have bad tolerances, and many times a very high failure rate! Testing it with a scanner or scan tool that can read live data is recommend. I have bought some Duralast, Wells, Airtex, and Standard brand parts that were Identical to factory installed parts, right down to mold numbers and date codes.
Also said that replacement of the computer and sensor resolved the check engine light from coming on but he still gets that split second hesitation in power. If the leaking manifold gasket is confirmed following the diagnostics steps, it must be replaced. Can a vacuum leak cause this problem? Joined: Oct 30, 2018 Member: 21119 Messages: Gender: Male First Name: Pândâ Vehicle: 2018 Panda Crewmax Suspension: front- Bilsein 6112 set at 1. I had o2 sensors and catalytic coverters change to no avail before. Also have a helper rest their foot on the gas pedal just enough to keep the engine running. The car was handed over to me and driving less than a mile Check engine light came again.
I got it home driving with 2 feet. I have Toyota Corolla 2005. How the code P0171 is diagnosed: With a good scan tool that shows the live data diagnosing the code P0171 is fairly easy. When a lean mixture code is present you must consider how the engine is running before diagnosis begins. I went back to Toyota and talked to another parts guy and told him about the P0171 code and what I replaced. If no idea, or its 80K plus, then it's a good move anyway to change it.
It turns out that the 97 Camrys have an old version computer that is related to the problem. A change in rpm indicate a potential leak but I've seen where a heavy spray can give a false positive. So I went back to looking at vacuum lines and replaced another small one but the old one did not look like it was leaking. The updated part number for the right hand side exhaust manifold is. On this page there are two sections; Section 1 is for lean bank 1 or bank 2.
I hope to post positive results by the end of the week. Inspect wiring as much as you can see. First is a brief overview of this code. I've done it on other vehicles so I definitely know what you're going thru. If the sensing element fails it will not deliver the proper feedback information causing a lean mixture code.
If it's P0141, it's the rear sensor or its wiring. They now have tests that can tell if these parts are not new, and that is why places like AutoZone can charge alot less!! Here is some good diagnostics From Repair Lean Mixture Codes P0171 or P0174 on some manufacturers The engine management system is designed to control the air fuel mixture the engine consumes. The main reasons for this condition are plugged fuel filter or weak fuel pump operation. Truck runs smooth and gives no indication of vacum leaks. You can also watch the fuel trims under a load too. I never tried the old one after cleaning the back side.
Try some fuel system cleaner after inspecting plugs. There are two types of lean mixture conditions, computer controlled and non-computer controlled malfunctions. Here is a picture of a mass air flow sensor on a 2008 Toyota Rav4. Now it has 137k on it without further problem. If that doesn't do it, it's probably time to enlist the help of a professional.
The Vacuum Booster behind the Master Brake Cylinder. Front oxygen sensor or air fuel ratio sensor Another very common Diagnostic trouble code for this Camry we see a lot is a P2238. Tech notes If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. Third pic shows the rest of the new hose up to the Vacuum Booster Click to expand. Any help you guys can provide, would be great! Can you go out and step on the brake 30 mins. If there are no intake leaks, the next step is to replace the air filter and clean the air flow meter.
Do I go to Toyota dealer? Take it out and spray it with electrical parts cleaner. Engine has run fine throughout this problem. You can test the mass air flow sensor using a scanner or a voltmeter. I also have a 2002 Sequoia and swapping filter into that same engine was fine no errors. If you find consensus to solve a problem that you are having on a few different websites, most likely it will work for you also. If no exhaust leak is detected continue to the next step.