What causes code P0171?

What causes code P0171?

This can be caused by something like a disconnected hose or vacuum leak, which means there’s more air than usual, or because your fuel system is weak. P0171 is a common trouble code in many vehicles. If there is too much air, the ECM or PCM overcompensates with larger fuel injections, which triggers the P0171 code.

How do I know if my mass airflow sensor is bad?

Symptoms of a Faulty Mass Air Flow Sensor

1. The engine is very hard to start or turn over.
2. The engine stalls shortly after starting.
3. The engine hesitates or drags while under load or idle.
4. Hesitation and jerking during acceleration.
5. The engine hiccups.
6. Excessively rich or lean idling.

What causes the p0171 code on a Cadillac?

The P0171 code could also be caused may be caused by one or more of the following: debris on the MAF sensor causing an incorrect reading, improper oil level, low or high fuel pressure, or Engine Control Temperature (ECT) Sensor reading inaccurate. There are Factory Service Bulletins for the following Cadillac models: 2000-2013 Cadillac All Models:

What does the p0171 code in front oxygen sensor mean?

If the P0171 is combined with the P0174 code, it’s very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replace the air filter and clean the air flow meter. If the problem persists the front oxygen (O2) sensor may need to be replaced.

What causes a p0171 fuel trim system Lean Bank 1?

If the problem persists the front oxygen (O2) sensor may need to be replaced. The P0171 code could also be caused may be caused by one or more of the following: debris on the MAF sensor causing an incorrect reading, improper oil level, low or high fuel pressure, or Engine Control Temperature (ECT) Sensor reading inaccurate.

How much does it cost to diagnose p0171 GMC code?

The cost to diagnose the P0171 GMC 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. Most auto repair shops charge between $75 and $150 per hour. | When is the P0171 GMC code detected? – Fuel injection system does not operate properly.