You can also watch the fuel trims under a load too. After it warms up the metal expands and its fine. My disconnecting the had left no codes to refer to. I get the car back and after a few week that dam light comes back on. There probably is a malfuction in the match up between the computer and the sensor feedback loop that is preventing the air and fuel ratio to be mixed properly.
My dad agreed with what he was telling me but my dad lives in another state so he was unable to fix it for me. Just hope I got the problem solved. For anyone else reading this, you dont actually have to reset the Check Engine Light, once the car adjusts that the car is no longer running lean, it will go away on its own. Fuel injectors The fuel injectors are also a common concern for these codes on this 3. I sprayed carb cleaner around the intake manifold when it was warmed up and running. The problem may be on a much smaller scale where the computer on the Toyota Corolla can compensate for the lean condition and the driver may never feel a hiccup while driving. 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.
Since my Corolla is older and has higher milage they are probably both going. Again, a dirty air filter can and will eventually cause the mass air flow sensor to get contaminated and go bad. In fact I took my time and cleaned out the throttle body and the intake manifold while it was apart. Fuel pump On these two vehicles, the Customer Concern is usually the check engine light will illuminate and Diagnostic Trouble Codes of P0171 bank 1 and P0174 bank 2 are stored in the computer. A: In the 2002 Corolla, the code P0171 is often caused by a bad or dirty mass airflow sensor or vacuum leaks. The throttle body gasket was compressed but could probably have been reused; however, for just a few bucks, I don't have to worry about it in the future. This past Thursday morning when starting my car for work it and let it warm up I took off and at each light I thought my car was going to stop.
First of all, thank you so much for sharing your solution. However, there three common causes for this lean condition and P0171 code and I will go over each of them in detail. The entire job took 40 minutes. This could be caused by a number of reasons, such as bad airflow sensor, vacuum leaks, low fuel pressure, clogged fuel injectors, etc. And if I recall, we did the same thing last year, but it returned after a few months. It seemed all hose clamps were not holding the hoses that strong.
Now I just need to fix my P0453 issue a more expensive part, but I still plan to do it myself to get my car back up to code. Test drive went well and it idles much smoother now. I have been getting a P0133 Bank 1 Sensor 1 code on my 2004 corolla every winter. These are also easy to replace. What torque should they be tightened to? Hard to start o long cranking time to starter is gona be the first symtoms. I got the same code in my corolla 2006 34k miles. I informed the auto parts store O'Reily's but who knows if they will do anything about it.
This will cause you to get increasingly worse fuel mileage. Once you have all the bolts removed, you shouldn't have to fight it out, the manifold should easily pull right out. Cleaning the air flow sensor may help temporarily; the proper repair involves replacing the faulty mass air flow sensor. The idea is to maintain the same temperature in the wire. This just happened to my 2007 Corolla with 66,900 miles.
I would also venture to speculate that this problem involves other Toyota products other than Camry, that use this same subsystem for fuel delivery. Toyota Technical Service bulletin 0074-08 addresses these codes. Not only is should be clean, but it should be stock. There were some other small differences in the bolts that I encountered but these were easy to handle. Yeah, the codes will eventually clear on their own, but what if the gasket wasn't the only problem? If the brake booster goes bad and leaks engine vacuum, it will affect the fuel trims and the computer will flag this P0171 lean code. Before you had old spark plugs pulling on an old battery so it was cool.
Open the hood, and locate the mass air flow sensor. However, it will go away when the lean codes are repaired. Should I replace it again to the orange one? I have a cheap scanner and I could see that the fuel trims were trying to fix the lean condition, maybe they were getting bad info from a failing O2 sensor, but when I put a little propane in the intake as it was running I could watch the fuel trims respond so the sensor was working. Could see those cute little pistons? I can barely push them down hard enough to get it to brake even slightly. Normal numbers at idle and high positive numbers under a load indicate a faulty mass air flow sensor. I do notice that just before the light comes on that there is a slight hesitation, split second, in the power. The new updated part numbers for the air fuel ratio for bank 1 is and for bank 2 is.
After putting it back in and resetting my check engine light, the car worked great! This was awesome because it was such an easy thing to do once I realized what I had to clean. Took my 07 corolla to the dealer and the receptionist said it may be the intake gasket though Autozone clerk was very skeptical on that. One day I magically passed emissions without doing any repairs on my car and the light went away. I take it into get smogged and it fails. It turns out that the 97 Camrys have an old version computer that is related to the problem. Low calculated load readings during a wide-open throttle acceleration can also indicate the mass air flow sensor is faulty.
We have a 2005 Corolla. The gasket fix will def solve horrible gas mileage issues, and the check engine light. As I left my buddy's house I floored the gas pedal and some smoke came out the back. P0171: oxygen sensor in bank 1 has detected a lean condition too much oxygen in the exhaust. If there is no vacuum leak, the engine rpm will not change as you spray carb cleaner around the intake.