What Does Engine Code P0174 Mean

P0174 O2 Sensor Circuit High Voltage (Bank 2 Sensor 1)

The O2 sensor on Bank 2 Sensor 1 is reporting a voltage that is higher than expected. This can be caused by a number of things, including a faulty O2 sensor, a problem with the wiring between the O2 sensor and the PCM, or a problem with the PCM itself.

So What Does Engine Code P0174 Mean?

P0174 is a generic OBD-II code that indicates that the oxygen sensor voltage on the bank 2 sensor 1 circuit is too low. This can be caused by a number of things, including a bad oxygen sensor, a wiring problem, or a problem with the engine’s fuel system.

What Does Engine Code P0174 Mean?

Engine code P0174 is a generic OBD-II code that indicates that the oxygen sensor on the bank 2 sensor 1 circuit is reporting a lean condition. This means that the sensor is reading that the air-fuel mixture is too lean, or that there is not enough fuel in the mixture.

Symptoms

There are a number of symptoms that can be associated with engine code P0174, including:

Reduced fuel economy
Engine hesitation or stalling
Rough idling
Increased emissions
A check engine light on the dashboard

Causes

There are a number of potential causes for engine code P0174, including:

A faulty oxygen sensor
A dirty or damaged oxygen sensor sensor
A problem with the fuel injector
A problem with the fuel pump
A problem with the mass air flow sensor
A problem with the throttle position sensor
A problem with the engine control module

Diagnosis

Diagnosing engine code P0174 can be a bit tricky, as there are a number of potential causes. However, there are a few things that you can do to narrow down the possibilities.

First, you will need to obtain a code reader and connect it to your vehicle’s OBD-II port. This will allow you to read the code and get some more information about the problem.
Next, you will need to inspect the oxygen sensor on bank 2 sensor 1. Look for any signs of damage, corrosion, or contamination. You may also want to test the sensor’s resistance to make sure it is functioning properly.
If the oxygen sensor appears to be okay, you will need to check the fuel system for problems. This includes inspecting the fuel injectors, fuel pump, and mass air flow sensor. You may also want to test the fuel pressure to make sure it is within spec.
If you cannot find any problems with the fuel system, you will need to check the engine control module. This may require a scan tool or a qualified technician.

Repair

Once you have diagnosed the cause of engine code P0174, you can begin the repair process. The specific repairs will vary depending on the cause of the problem. However, some common repairs include:

Replacing the oxygen sensor
Cleaning or replacing the mass air flow sensor
Replacing the fuel injector
Replacing the fuel pump
Replacing the throttle position sensor
Reprogramming the engine control module

Prevention

There are a few things that you can do to help prevent engine code P0174 from occurring, including:

Keeping your vehicle’s fuel system clean and well-maintained
Using quality fuel
Inspecting your oxygen sensors regularly
Having your vehicle serviced regularly

Also Read: What Does Engine Code P0300