Air Flow Sensor Engine Light Price To Replace Mass P0171 and P0174 Codes – Don’t Replace an Oxygen Sensor Before Reading This

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P0171 and P0174 Codes – Don’t Replace an Oxygen Sensor Before Reading This

So your car’s CEL (check engine light) is on and you’ve scanned the codes at the local parts store. Your car has either a P0171, P0174 lean fault code, or both stored in the computer, these codes are based on the oxygen sensor (O-2) readings. A lean code or codes indicate that there is too much oxygen in the exhaust. Remember that parts stores have well-intentioned employees but may not have the necessary experience to interpret what a trouble code is really Meaning These codes are based on oxygen measurements in the exhaust. A common mistake with lean code is replacing the oxygen sensor. This can be a very expensive mistake that won’t fix the problem. Especially if both codes are present, as it is highly unlikely that both O-2 sensors will fail at the same time.

Probably A vacuum leak is the cause. A vacuum leak can be caused by a vacuum hose, intake gasket, or possibly a leak from the air intake hose from the MAF (Mass Air Flow Sensor). Listen for a hissing sound that will lead you to the source of the problem. Some technicians will use a propane bottle with a hose attachment to help locate vacuum leaks. It’s not as easy to check for vacuum leaks this way with today’s computers because the ECU (Electronic Control Unit) will quickly compensate for added fuel and it’s hard to notice changes at idle. When checking for leaks with propane, oxygen sensor readings can be monitored with a scan tool by looking for increased readings while enriching the mixture. Another way technicians can check for vacuum leaks is with a smoke test. By drawing smoke into the vacuum hose on the engine, the leak will be revealed when the smoke clears from the problem area.

Aftermarket air filter Those that use oil on the element can sometimes damage the MAF. Over oiling the air filter can cause some excess on the MAF sensor wire or element. This can change readings, tricking the ECU into seeing too little or too much air flow and therefore changing the air/fuel mixture incorrectly. I once worked on a car that wouldn’t start that had a problem with the MAF. Looking at the wire from the MAF, there was a burnt piece of debris that made it past the air filter. After cleaning the sensor the car ran perfectly. The ash on the MAF sensor wire was changing the reading by enriching the mixture so much that the car wouldn’t start. After talking to the customer he said the air filter was just changed. This apparently happens when some debris gets into the air intake hose that settles on the MAF’s hot wire.

fuel pressureA lean condition may also occur. If the fuel filter is clogged or the fuel pump pressure is low, the exhaust may also have high levels of oxygen. However, most of the time, the ECU will compensate for the reduced fuel quantity. So this is one of the least likely causes of lean code.

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