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- #OL FAULT 2003 MAZDA 6 P0171 FULL#
- #OL FAULT 2003 MAZDA 6 P0171 CODE#
- #OL FAULT 2003 MAZDA 6 P0171 PC#
When there are more than 14.7 parts air to 1 part fuel in the air-fuel mixture, a lean condition exists and code P0171 is triggered. What Does P0171 Mean?Ĭombustion engines run most efficiently when they maintain an air-fuel mixture ratio of 14.7 parts air to 1 part fuel. If the PCV valve does not rattle, then it needs to be replaced.Bank 1 has too much air or not enough fuel. One final test is to remove the valve itself and give it a shake. Deal with any issues you find here or replace the hoses if needed before reconnecting and checking if the problem is solved. If this does not solve your problem, then disconnect the hoses and scrutinize them. Next, identify the mesh filter beneath the valve and replace it. If these are worn, then the part needs to be replaced. Begin your checks by inspecting the rubber parts of the valve. To do this, you need to first identify the PCV valve and the hoses connected to it. There is no one PCV valve test however, there are a few steps you can take to determine whether it is working correctly. If none of the issues highlighted by your engine check system is the problem, then you need to check the PCV valve. The problem, as we have described, is that you may not get precise readings from your diagnostic computer as to the cause of the problem.
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If you are experiencing any of the problems outlined above, then there is a chance that your PCV valve has failed or is stuck open. The diagnostic computer may lay the blame at the oxygen sensor or the mass airflow sensor because of the airflow increase caused by the stuck PCV valve. A stuck open PCV valve can also trigger the check engine warning light. You may also see engine oil in the PCV valve or the hose. In these cases, you may experience the engine misfiring while it is idling, a lean fuel to air mix or increased oil consumption. When the PCV is stuck open, or there is a disconnection or rupture in a system hose, a vacuum leak is created. However, of the PCV valve is stuck open, then you may notice different signs.
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If the PCV valve is failing or has failed, you may also notice an increase in internal engine pressure, black smoke, or surges in the engine. Other codes to watch for include the oxygen sensor code and the mass-air-flow meter code. Diagnostic codes P0171 and P0174 are common when there is a problem with the PCV valve. If the PCV valve sticks open, it may cause the check engine light to come on. If you see a dirty or oily spot near to the PCV inlet hose, then this is an indication of a bad PCV valve. The source of the noise can be tested by blocking the vacuum source to the valve and listening for changes to the noise.Ī bad PCV valve, can in some vehicles, cause oil to blow onto the air filter element. A failed PCV valve may produce a low moaning, whining, or whistling sound.
#OL FAULT 2003 MAZDA 6 P0171 PC#
However, there are other early signs that the PC valve is not working effectively.
#OL FAULT 2003 MAZDA 6 P0171 FULL#
This is due to the engine not reaching full temperature during its use and, therefore, not being able to boil off and be scavenged by the PCV system.Ī buildup of sludge in the engine and worsening of oil leaks are also signs of a bad PCV valve. Those that use their vehicle for regular short trips, under ten miles, need to change their oil more regularly than those who undertake longer trips. If there is moisture in the system, then replacing the valve alone won’t fix the problem, you also need to change the oil. However, this is also an indication of other problems. The cloudy or milky film mentioned above is one sign that your PCV valve needs replacing.