Can a vacuum leak cause an oxygen sensor code?

The real problem may not be a bad O2 sensor, but possibly be an engine vacuum leak, low fuel pressure or dirty fuel injectors that are causing the engine run lean. An engine misfire, leaky exhaust valve or a leak in the exhaust manifold gasket that allows air into the exhaust may also cause this type of code to be set.

What causes a P0174 code?

The most common causes of the P0174 code are the following: Vacuum leak due to damaged intake manifold gaskets or punctured vacuum and positive crankcase ventilation (PCV) hoses. Malfunctioning mass airflow (MAF) sensor. Clogged fuel filter.

What to do if your Toyota Camry has a p0174 code?

If there are no intake leaks, the next step is to replace the air filter and clean the airflow meter. If the problem persists the front oxygen (O2) sensor may need to be replaced. The cost of diagnosing the P0174 TOYOTA code is 1.0 hour of labor.

What does p0174 mean on a fuel trim system?

P0174- Fuel Trim System Lean → Bank 2: P0174 indicates that the side of the engine with the first cylinder (Bank 2) is running lean. On inline engines, this code is not available, since there is only one “bank” of cylinders.

What does the OBD2 code p0171 mean on a Toyota Highlander?

P0171 and P0174 both indicate that there is a lean condition present in your Toyota Highlander. By themselves, these are some of the most common OBD2 codes. When they appear together, it indicates that the entire engine is running lean. Both of these codes are generic, which means they have the same meaning (Highlander or not).

How much does it cost to replace the p0174 Toyota O2 sensor?

If the problem persists the front oxygen (O2) sensor may need to be replaced. The cost of diagnosing the P0174 TOYOTA 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.