What does it mean when your fuel trim says p0173?
P0173 means there was a malfunction in the computer’s control of the air:fuel ratio. It also indicates that the fuel trims reached their limit of adding fuel while trying to compensate for a actual or perceived rich condition.
How long does it take to get a p0173 code?
A dirty air filter or a faulty air flow sensor are a common cause for the P0173 code of the problem. The cost to diagnose the P0173 code is 1.0 hour of labor. The auto repair’s diagnosis time and labor rates vary by location, vehicle’s make and model, and even your engine type.
What are the symptoms of DTC code p0173?
Symptoms of a P0173 DTC may include: Potential causes include a vacuum leak, unmetered air leaks Fuel saturated engine oil Leak in turbo air charge hoses (if equipped) Possibly bad O2 sensor (If Mercedes, may require adaptation with M-Benz compatible scan tool.) Oil contamination in MAF connector or O2 sensor connectors.
What causes Mercedes Benz to run with p0170 and p0173?
If you clear the P0170 and P0173 without fixing the underlying problem those two codes will return in a couple of days. Under certain circumstances such as vacuum leaks, the car may run fine even if the CEL light is on and P0173/P0170 are present. The most common cause of P0170 and P0173 on a Mercedes-Benz is a defective mass-airflow sensor.
What does p0171 and po174 mean?
A continual low voltage reading indicates a lean fuel mixture, too much oxygen. The optimal ratio is 14.7:1 (air:fuel). When your powertrain/engine control module receives a reading that indicates there’s too much oxygen and the ratio is incorrect, it sends an error code P0171 or P0174.
What does p0173 fuel trim code bank 2 mean?
In writing this article I’ve added Mercedes-Benz-specific info since it seems that M-B (and VW) are most prone to having this P0173 surface along with misfire codes or other fuel trim codes. P0173 means there was a malfunction in the computer’s control of the air:fuel ratio.
A dirty air filter or a faulty air flow sensor are a common cause for the P0173 code of the problem. The cost to diagnose the P0173 code is 1.0 hour of labor. The auto repair’s diagnosis time and labor rates vary by location, vehicle’s make and model, and even your engine type.
What causes fault codes p0170 and p0173?
If P0170 and P0173 were caused by a bad MAF sensor and you replaced the sensor, the CEL should turn off in a couple of days. Even if you don’t clear the codes. If the fault codes are caused by a vacuum leak, the CEL will stay on or return.