Ford Expedition lean codes could caused by a leaky PCV hose.

If a car has a check engine light on and has P0171 and P0174 codes stored, the most likely cause is a vacuum leak. These codes are set by the car’s computer when it sees too much oxygen in the exhaust. Excessive oxygen readings in the exhaust will set lean codes. This does not mean that the oxygen sensors are defective. It is a common mistake for people to replace oxygen sensors when lean codes are present. Just because the code is related to oxygen sensor readings, it doesn’t mean that the oxygen sensors are bad. If both of these codes are stored this means that both banks of the engine have excessive oxygen in the exhaust. If the oxygen sensors are replaced it’s most likely that the same codes will reappear. It is very uncommon for two oxygen sensors to fail at the same time.

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Tree style masking stations like this one holds paper and tape for easy access.

Professional autobody paint shops prevent much overspray by masking the car well prior to painting. Taking time for preparation can save a lot of time on cleanup later. Masking machine stations hold rolls of paper and masking tape for easy application. Windows trim pieces and tires can be taped off to prevent overspray. Many do-it-yourselfers don’t realize how easy it is to get overspray on the car. When there is a chance of getting overspray on the vehicle its best to mask the car.

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