How do I fix code P0170?
What repairs can fix the P0170 code?
- Correcting any condition that causes the engine to run rich.
- Correcting any condition that causes the engine to run lean.
- Replacing the powertrain control module.
What can cause P0170?
The PCM may log the P0170 code for the following reasons:
- Contaminated Engine Oil (too long since the last oil change)
- A leaking injector.
- Excessive fuel pressure due to restriction along the fuel return line or a faulty fuel pressure regulator.
- A saturated Carbon Canister due to packing the fuel tank.
- Clogged air filter.
What does the code P0173 mean?
Code P0173 is triggered by the engine control module (ECM) when it detects that the air-fuel ratio is too lean or too rich. For most lean and rich conditions, the ECM can compensate for the lack or air or gas entering the engine. However, if the amount of compensation is too much, a P0173 code may set.
What causes fuel trim problems?
Fuel trim can be affected by just about anything between the air filter and the muffler, including sensors, injectors, ignition, EGR, the engine’s mechanical condition and even the crankcase ventilation system.
Can a dirty air filter cause a P0171 code?
Can a dirty air filter cause a P0171 code? If the filter is clogged or excessively dirty, this is enough to impede or restrict the air flow, hence resulting in a lean running condition. Besides a dirty air filter, the P0171 code can also be blamed on a dirty or faulty MAF sensor and a clogged fuel filter.
What is fuel trim Bank 2?
Diagnostic trouble code (DTC) P0173 stands for “Fuel Trim Bank 2.” This code indicates that your car’s fuel trims have reached their operational limitations (maximum rich or maximum lean). Fuel trim is the ongoing adaptation that the PCM makes to the fuel mixture to maintain a balanced air-fuel ratio.
What causes P0171 and P0174 codes?
P0171 is triggered by the engine bank 1 “upstream” oxygen sensor and P0174 is triggered by the engine bank 2 “upstream” oxygen sensor. The oxygen sensor alerts your system when the condition is too lean meaning there’s too much oxygen in the exhaust.
How do I check my fuel trim?
How to Read Fuel Trim. The fuel trim value is read by plugging a scan tool into the OBD II diagnostic connector located under the instrument panel (on the drivers side near the steering column). When the key is turned on, the scan tool will initialize and start to communicate with the vehicle’s onboard computer.
How do you reset fuel trims?
This is done by disconnecting the battery, waiting for 10 minutes or so, and/or turning the ignition key to the starter position to discharge the system.
How do I fix P0171 system Too Lean Bank 1?
What repairs can fix the P0171 code?
- Replacing the fuel pump.
- Replacing the fuel filter.
- Replacing the fuel pressure regulator.
- Replacing the powertrain control module.
- Replacing one or more injectors.
- Replacing one or more oxygen sensors.
- Replacing the mass air flow sensor.
- Repairing a vacuum leak.
Is it OK to drive with a P0171 code?
Any time your check engine light is on, you should take the reading seriously. A P0171 code is no exception to this rule. When the engine stores this code, you should not drive your vehicle far, if at all. When your engine runs lean, there is not enough gasoline for it to run efficiently.