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.
How much does it cost to diagnose a p0173 code?
The cost of diagnosing the P0173 code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour. When is the P0173 code detected? – Fuel injection system does not operate properly.
What to do if your oxygen sensor says p0170?
Common misdiagnosis includes bad Oxygen sensors or worn spark plugs. These items are unlikely to fix the P0170/P0173 codes. Always clean or replace the MAF sensor first. First, clean the Mass Air Flow (MAF) sensor. You will need MAF Sensor Cleaner to spray on the sensor.
Can a mechanic misdiagnose a Mercedes p0170?
If you troubleshoot this issue based on the two codes, a mechanic can misdiagnose the problem. In fact, these two codes are often misdiagnosed. Common misdiagnosis includes bad Oxygen sensors or worn spark plugs. These items are unlikely to fix the P0170/P0173 codes.
What does the code p0173 mean on a fuel trim?
When the fuel trim reach its limit, the PCM will set the error code, indicating a malfunction in fuel trims. It can also be the same malfunction but on Bank 2, which would be error code P0173.
What does the PCM error code p0173 mean?
Error Code P0173 is set when the PCM has detected an anomaly on fuel (fuel trim) that is outside the range of the vehicle’s specifications. This can be a negative or positive trim. This code means there’s a malfunction in the computer’s control of the air to fuel ratio.
What does it mean when your air filter code is p0170?
Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins. What does this mean? Dirty air filter, air filter housing or Mass Air Flow (MAF) sensor, or faulty MAF sensor are common causes for the P0170 code.
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 a p0170 mean on a PCM?
When the fuel trims reach their rich correction limit, the PCM (Powertrain Control Module) sets a P0170, indicating a problem or malfunction in the fuel trims. It may also have a P0173 referring to the same malfunction but on bank two. Symptoms of a P0170 DTC may include:
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.
Can a bad O2 sensor cause a p0170?
A bad O2 sensor could cause a P0170, or P0173. Repair cause of oil leak and replace oil-fouled O2 sensor. Among several codes my car has, one is P0447 which is listed as EVAP emission system – vent control valve circuit open. No idea as to where to start checking as i am not sure if this car has a sensor in the fuel tank.