P0170 OBD-II: Fuel Trim
P0170 Severity
Should you fix P0170 yourself?
Identifying an OBD code is just the start of a complete diagnostic routine. Most trouble codes are caused by a sensor reporting a value that is out of range. Just replacing a sensor may not fix underlying issues. Be sure to understand the code, the part or system in your car that the code refers to, and the risks of delaying professional repair.
Proper diagnosis will save you time and money on unnecessary repairs.
Urgent codes indicate immediate action is necessary. These are urgent and significant malfunctions that can cause severe damage to the vehicle or harm the driver and passengers.
What causes OBD-II fault code P0170?
The engine control module (PCM) uses multiple sensors to determine the required amount of fuel needed to keep the engine running efficiently. If the PCM cannot achieve the desired balance between fuel and air, it will set code P0170.
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What Does P0170 Code Mean?
Fault Code Definition
Long Term and Short Term Fuel Trim are the methods used by the Powertrain Control Module to continually adjust the air to fuel ratio in order to maintain the 14.7 to 1 (Stoichiometric) mixture that is ideal for combustion. Code P0170 is set when the Powertrain Control Module has reached its operational limit with these adjustments.
P0170 Symptoms
- Check Engine Light will illuminate
- In many cases, no abnormal symptoms may be noticed
- In some cases, the vehicle may get poor fuel mileage
- In some cases, the engine may hesitate during acceleration
Common Problems That Trigger the P0170 Code
- Intake Manifold vacuum leaks
- Defective Mass Air Flow Sensor
- Defective Mass Air Flow Sensor wiring or connections
Common Misdiagnoses
- Oxygen Sensor is replaced when the real problem is a vacuum leak
- Oxygen Sensor is replaced when the real problem is a defective Mass Air Flow Sensor
Ask our experts about P0170.
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