What causes the p0172 OBD-II trouble code?

What causes the P0172 code? A dirty mass air flow sensor overstating the amount of air entering the engine which may cause excessive fuel delivery A faulty fuel regulator, which may not be regulating the pressure of the going to the engine as it should

What does ECM mean on Chevy p0172?

P0172 Chevrolet Meaning. The Engine Control Module (ECM) controls the air/fuel metering system in order to provide the best possible combination of driveability, fuel economy, and emission control. Fuel delivery is controlled differently during Open Loop and Closed Loop.

What does it mean when fuel trim is p0172?

Ideally, the Long Term Fuel Trim should be close to 1 to 2 percent. When a code P0172 is set, it means that the Fuel Trim is anywhere from -15 percent to as low as -30 percent compensated. When this happens, the computer knows that there is an improper condition in the control of the Fuel System.

Can a dirty air filter cause a p0172 code?

Like any other OBD-II code, a P0172 can be caused by a variety of problems. In other words, there is no easy way to pinpoint what’s causing the problem other than examining the critical parts responsible for maintaining the right fuel mixture. A dirty air filter can cause code P0172.

Why is my p0172 system too rich bank 1?

Check for an exhaust leak before the first oxygen sensor (this is unlikely to cause the problem, but it is possible) P0171 is showing on scanner but not a service light on , then after about 30 miles p0172 go’s active and turns service engine light on . Seems like it’s running fine ,but cannot get anyone to figure out the 172 code rich bank 1 .

Is it okay to drive a car with p0172?

It is okay to drive a vehicle with P0172 for a short period of time, but driving with this code for an extended period of time can cause internal engine damage and failure of the catalytic converter. Code P0172 Common Diagnosis Mistakes It is important to complete the entire diagnostic process when diagnosing P0172.

What is the trouble code on a Chevy Trailblazer?

A common trouble code with the Chevy Trailblazer is P0172. This code number references a number that is given to you when you plug your car into a OBDII scanner. It’s not the most complicated OBDII trouble code to diagnose. It is also one of the most common.

What does p0172 mean on a fuel trim?

Regarding your fuel trim problem, P0172 means the engine is using too much fuel, and the ECM is trying to reduce it. If there are fuel problems, such a leaking fuel injector or stuck fuel pressure regulator, unmetered fuel will simply dump into the cylinders.

What happens if the p0172 code is too rich?

If the the air-fuel ratio is rich enough, a black smog will come out of the exhaust, which is harmful to the environment. What repairs can fix the P0172 code? It is highly recommended to check the condition of the spark plugs and the operation of the coolant temperature sensor. Need help with a P0172 code?

What does p0174 mean on a bank 2 engine?

Basically this P0174 code means that the upstream oxygen sensor in bank 2 reporting a lean condition (too much oxygen in the exhaust). On V6/V8/V10/V12 engines, Bank 2 is the side of the engine that doesn’t have cylinder #1.

What causes the system too lean code OBD-II?

The ECM is designed with the capability of adjusting a lean condition back to normal, but only in small to mediocre amounts. If the air fuel ratio requires more compensation to return to normal than the ECU is capable of, code P0174 may set. What causes the P0174 code?

What does Bank 1 mean on an OBD engine?

Although generic, the specific repair steps may vary depending on make/model. Basically this means that an oxygen sensor in bank 1 detected a rich condition (too little oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.

What does it mean when p0171 is too lean Bank 2?

In plain English, this means that the PCM has detected a vacuum leak (it may be real or perceived) and is compensating by injecting the maximum amount allowed (under its program) of fuel into the cylinders for bank 1. P0174: System Too Lean Bank 2. PCM’s Adaptive Fuel Strategy has reached its rich calibrated limit for bank 2.

What causes a p0172 code in OBD-II?

What does it mean when engine Bank 2 is too lean?

A lean condition is brought about by an imbalance in the air to fuel ratio due to either insufficient fuel (from, say, a weak fuel system) or excessive air entering the engine. The bank 2 portion indicates that the problem is concentrated on the side of the engine opposite the #1 cylinder. The error codes for these conditions are P0171 and P0174.