Thanks Hello Car People - My check engine light came on about 6 months ago and went out after I bought gas. This cycling happens around once or twice per second. If anybody has any new updates, please post them. A: The code P0300 means that multiple cylinders are misfiring. My guess is my fuel filter is ready for a change or the fuel pump assembly is ready for a change.
The place to start is by having the code s read and recorded. I have seen cracked injectors on this model as well. Drive for a month then the light comes back on. We have the best products at the right price. The Smog check failed becasue of this. After putting it back in and resetting my check engine light, the car worked great! The calculated load reading should increase to 85% or higher on a wide open throttle acceleration.
Its been a while since anything was done to the car, so as a starter, I put new oil and filter, and new plugs. Technical Tip: While watching the fuel trims on your scanner, engine fully warmed up, step on the brake pedal. Nearly all Toyota gasoline engines strive for a 14. If you have one injector that you suspect is bad or plugged up causing the engine to misfiring, you can swap that fuel injector with another fuel injector from a different cylinder to see if the misfire code or misfire condition moves along with the fuel injector. This is provided you have a scanner with the update or refresh rate fast enough you can see live data as fast as it changes.
P0171 is System Bank 1 Lean, P0174 is System Bank 2 lean. The tips or ends usually plug up restricting fuel flow resulting in a lean condition. Was there any work done recently to the vehicle or anything unusual before this code was thrown? I have seen several Toyotas with intake manifold gasket leaks. I do start to feel these very slight hesitations while drive. Bank 2 is simply the other bank. I've been having the same problem as all of you.
Cleaning the air flow sensor may help temporarily; the proper repair involves replacing the faulty mass air flow sensor. It may or may not be associated with the P0171 lean code. Toyota Technical Service bulletin 0074-08 addresses these codes. Two weeks later the light comes on again. Sometimes you can clean the sensor element but most of the time replacement is necessary. Some auto parts stores will scan for free, call a few and find out.
Then the light goes off. For example, if over time, the engine gradually develops a small vacuum leak, it makes the engine run leaner more air and less fuel. However, keep in mind, the theory and operation is still the same when it comes to a lean condition on the V8 engine and all other internal combustion engines with this similar Toyota fuel system. Comes back on an hour later. Engine was replaced a couple years ago with a Japanese job.
So far it hasn't come back. Air fuel ratio sensor has failed. I take it back to the dealership and get a full service for 105k. If I'm getting both of these codes at the same time, could it mean I have some type of a vaccum leak? Check out free battery charging and engine diagnostic testing while you are in. Technical tip: A leaking intake manifold gasket will cause this lean code to set during the warm up process in most cases.
Trouble shooting a misfire, Code P0300, P0301, P0302, P0303, P0304, P0305, P0306,. The new updated part numbers for the air fuel ratio for bank 1 is and for bank 2 is. Based on my experience, if this was the case, it will also flag large and small Evaporative Emission codes. I called a couple shops and they said check the gas cap. You don't need to know, you just buy them for that vehicle.