What does the automobile fault code P0 170P0 172 mean?

p0 172？ The fuel system mixture is too rich.

The reasons for this are:

1. According to the setting conditions of the fault code, the relevant detection methods-whether the fuel pressure is correct, whether the air intake and exhaust system leaks, and whether the air flowmeter signal is normal.

2. According to the state displayed by the voltage signal of the oxygen sensor, the fuel injector is blocked, resulting in insufficient fuel injection. Relatively speaking, there is more air, less fuel injection and lean air-fuel ratio, which makes the idle speed jitter and the signal voltage of oxygen sensor low.

3. Air flowmeter-signal deviation-can't meet the normal air-fuel ratio formation conditions, resulting in unbalanced mixture and incorrect fuel pressure-too low or too high pressure will make the mixture concentration incorrect.

4. The above monitoring strategy-the engine ECM judges by the signal voltage of the oxygen sensor. If it deviates from the set value in the memory and meets the fault setting conditions, the corresponding fault code is stored.

Solution:

Clean throttle valve, replace filter or oxygen sensor failure.