Question about 2005 Dodge Ram 1500

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I change my oxygen sensor yesterday and now is bad again engine light came on again they change the oxygen sensor again but the mechanic thinks something else might be going on but they not sure

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Your vehicle’s computer system has self-testing capability. When the computer senses that there is a problem with one of the components or sensors it stores the correspondent trouble code(s) in its memory and lights up the "Check Engine" or "Service Engine Soon" light to tell you that there is a problem and you need to diagnosed and repaired it. The list of possible codes number in the hundreds. What codes were found to tell you the O2 sensor was bad? Remember there are more than one on your truck. If the underlying problem is not addressed the light will come back on. Excessive oil or engine coolant getting on the sensor can make it fail.

Posted on Mar 05, 2009

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Possible Causes
The following are malfunctions that could cause a rich condition:
^ Fuel pressure too high. Perform fuel pressure test.
^ Leaking fuel injector(s). - Perform pressure leak down test.
^ Vacuum leak around the MAP sensor grommet.
^ Oxygen sensor contamination.
^ Restricted exhaust or air intake.
^ Fuel Vapor Canister saturated with fuel.

IMPORTANT:
If the front oxygen reading voltage is above 600 mV and the rear HO2S is above 600 mV all the time, the O2 sensors are probably not
at fault.

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