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These may be few possible reasons why the check engine light won't go away after replacing the O2 sensor in your 2000 Mitsubishi Eclipse V6
·The wrong O2 sensor was replaced or the O2 sensor is properly connected to the wiring harness(any signs of damage or corrosion).
·Sometimes, issues with the engine, such as misfires, vacuum leaks, or problems with the fuel system, can trigger the O2 sensor to report a problem. Ensure your engine is running smoothly and there are no other issues that could affect air/fuel ratios.
·The new O2 sensor is defective. If the O2 sensor is working properly, then the check engine light could be due to another problem with the exhaust system, such as a leak or a problem with the catalytic converter.
·Problem with the wiring to the O2 sensor. If the wiring to the O2 sensor is damaged or corroded, it can cause the sensor to malfunction and trigger the check engine light. To diagnose the exact cause of the problem, you will need to have the car scanned by a qualified mechanic. The mechanic will be able to read the trouble codes from the computer and use that information to pinpoint the problem.
Usually these are located on the exhaust manifold or just below the exhaust manifold and you should be able to see it in the engine bay. On V6 engines there will be one sensor on each of the 2 exhaust banks.
You will probably need to remove the engine cover to see the sensors on your exhaust.
If someone told you to replace these because you got a particular fault code I would be wary. A decent scan tool and basic diagnostics can show if the 02 sensor is working or not. Some faults often blamed on an 02 sensor are not due to faulty sensors.
I guess I should start by saying that trouble codes do not instruct the mechanic to replace a component. Only to check it.
Code 31 is for a problem with the heater circuit for that O2 sensor. The sensor is not warming up fast enough to satisfy the engine computer. Since you have replaced the sensor, the actual problem could be in the wiring or the source of power for the heater built into the sensor.
bank 1 sensor 2 is not the upper sensor, it is behind the cat converter, replace it, disconnect the battery and go drive it to somewhere to have the codes cleared. It will relearn the fuel table to run properly
This code can also be caused by a thermostat that failed open. Is the engine heating up normally or taking longer than usual? Are there any symptoms? Did they run tests on the sensor? Personally, I perfer mechanics that confirm the fault before replacing parts. Too many of them do that. Be thankful that yours doesn't.
check engine light will not go out or codes cleared till computer is cleared so if you have set off a code while trying to diagnose it will stay in memory with that in mind
PO171 & 174 are related to bank 2 lean o2 sensor reading high oxygen in exhaust at sensors PO120 has to do with throttle position sensor input out of range PO306 is a misfire in #6 cylinder
in my opinion any miss will cause o2 sensors to read lean because the cyl is in effect a air pump sensors only pick up o2 not the fuel does you engine run rough or hesitate/shaking on acceleration i would check coil wire and plug for #6 also the injector not working will cause miss also they look ok do compression test on cyl will read 150psi if you find cause of miss you will be able to diagnose lean
with the tps sensor check to see if the connector was disconnected at any time you were testing
basically you need to isolate misfire and fix then have the computer cleared of codes drive car and if engine light comes on then we will go through test procedures for new codes
i hope this helps you to get a few ideals on how to proceed good luck ley me know
Fuel trim too lean. Usually means vacuum leak. Look for crushed,broken or melted off vacuum hoses near intake manifold. Or an obvious hissing noise at a normal idle. If so replace or repair clear codes your done. If not obvious take carb cleaner spray with nozzle attached car running & go over all vacuum hoses,intake manifold,egr valve see if idle raises if so you found leak. Repair. Could also be bad oxygen sensor switching bad o2 sensor but rarely.
The best thing to do is go to Auto Zone and get your Hyundai scanned for a DTC code. That would tell us which O2 sensor has gone bad. You have three O2 sensors and one of them has gone bad, the O2 sensor sends signals to the ecm to control the air fuel mixture so it will not run to rich or to lean which is causing you to fail the state inspection. Good luck and keep me posted on what the DTC codes are, be glad to help.
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