At Fixya.com, our trusted experts are meticulously vetted and possess extensive experience in their respective fields. Backed by a community of knowledgeable professionals, our platform ensures that the solutions provided are thoroughly researched and validated.
1995 toyota privia 2.4 supercharged 2 wheel drive.po171 code and did everything.i think it is in the turbo boost to fuel ratio
Changed o2 sensors,mass air flow,temp sensor,tune up,checked fuel pressure before and after fuel filter,smoke test and spray test,replaced fuel injector seals
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
PO171 OBD2 Code basically this means that an oxygen sensor in bank 1 has detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1. The P0171 is one of the more common trouble codes.
his code is triggered by the first downstream (front) O2 sensor. The sensor provides a reading of the air:fuel ratio leaving the engine's cylinders, and the vehicles powertrain/engine control module (PCM/ECM) uses that reading and adjusts to keep the engine running at that optimum ratio of 14.7:1. If something is not right and the PCM cannot maintain the 14.7:1 ratio, but rather there is too much air, it triggers this code.
This means the bank 1 sensor is showing that it is running lean this may be due to a bad oxygen sensor, fuel being restricted to the engine, or even a bad mass air flow sensor which could cause the computer to try and compensate air/fuel mixture. O2 sensors are rather pricey and should be checked by a scanner. They should have a minimum and maximum voltage read and if it is out of whack to normal specifications then that is the faulty sensor.
Code P1135 is a vehicle specific code for selected Toyota vehicles - it really helps to know what car you are working on...Year, Make, Model, Engine Size, Automatic or Manual Transmission, etc. There may be Technical Service Bulletins that apply to your vehicle that cover things like reprogramming the engine controller to correct this code, etc. Nobody can give you that information if they don't know what kind of vehicle we are talking about.
In general, the code description for code P1135 is "Air Fuel Ratio Sensor Circuit (California Emissions )"
The possible causes are
1. Open or shorted Air Fuel Ratio Sensor (AF) circuit
2. Faulty AF sensor
3 AF sensor heater or heater circuit shorted or open
4. Engine Control Module (ECM) Fault
The Mass Airflow Sensor (MAF) cannot cause this code - this is a "CIRCUIT" code, not a not a "LEAN" or "RICH" Oxygen Sensor (or AF Sensor) code. The MAF can only cause lean or rich codes.
Most of the time, this code is caused by the sensor itself, however, as I mentioned earlier, there are Technical Service Bulletins for several Toyotas that involve reprogramming of the Engine Computer.
These are both air fuel ratio sensors, These sensors are located in the exhaust manifolds, the front one (bank 2) is easy to get to, the one in the rear is more difficult, they
require a special socket to remove and install. The O2 sensors are
located behind the catalytic converter and are not the same as the A/F
ratio sensors.Replacing the sensors is not what the codes are telling you.You could have a plugged air filter giving you diminished air intake. That's not a bad sensor. A mass air flow sensor could be reading bad and giving you a bad mix of fuel so that your O2 sensor reads a problem. Get it? Or the O2 sensors could be bad after all, probably not both though.
P0171 - Fuel Trim System Lean Bank 1 YOU WILL NEED TO AVE THE DEALER TEST THE O2 SENSOR FOR PROPER SWITCHING, RIGHT NOW IT SHOWS ALWAYS LEAN, THIS MAY BE THE SENSOR OR THE ENGINE MAY REALLY BE LEAN ON FUEL AIR RATIO, AS FAR AS THE SMOKE GOES THE 2 ARE PROBABLY NOT RELATED, HOW MANY MILES ON CAR? IF THE MILES ARE HIGH THEN REPLACE THE O2 SENSOR ON THE CYLINDER BANK WHERE # 1 CYLINDER IS LOCATED, THE SENSOR IS THE ONE BEFORE THE CATALYTIC CONVERTER.
×