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I got a service engine light on my wife’s 2000 chrysler grand voyager 3.3L. My helpful local Autozone dudes plugged in their code reading tool and got code P0140. The read-out seems to indicate that it may be a failed oxygen sensor or the fuel system is running rich or lean. One of the Autozone guys said that, before I replace the oxygen sensor or fuel pump, I should clean the fuel injectors. So, my question becomes: Is it correct that I should first clean the fuel injectors before moving to other causes? And, if so, how should I go about cleaning them? I have heard that you can add a can of ‘Seafoam’ to a tank of gas and run that through at highway speeds. I have seen youtube videos of guys clamping off the fuel line and running an injector cleaner through the injector rail under pressure with the engine running. And others show compete removal of the injectors to clean them. Eric, any chance of doing a video on the good, better and best ways to clean the injectors?
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Thank you, BarneyB for the response. I’m still trying to figure this out. There are two oxygen sensors, there does not seem to be any indication of which one is bad. And on the code print out, it gives four probable causes. 1) O2 sensor is bad, 2) fuel system running rich or lean, 3) Engine misfire, 4) fuel pressure high or low-fuel pump or pressure regulator
They said they could test the O2 sensor at Auto Zone. I guess the next step may be to remove them and take them to be tested. I’m not looking forward to removing the front O2 sensor, it’s a tight fit to access it behind the engine in a Chrysler Voyager.
Maybe drive the vehicle until you get the code again. The code does include information on which 02 sensor the computer is complaining about.
You’re right, the printout indicates bank 1, sensor 2. With some further research, it seems that the 3.3l engine in the 2000 chrysler voyager has only one bank. Sensor 1 is after the exhaust manifolds and sensor 2 is after the catalytic converter. I removed sensor 2 and now I’m going to take it to autozone to see if they can get a test on it. Thanks again.
There is no test outside of the vehicle. At this point, I would just replace it. As for cleaning injectors for that code, it would be a waste of time. That O2 sensor is there for catalytic converter monitoring. This video has more info.
As for how to proceed with a performance issue, this article may help.
http://www.ericthecarguy.com/faq/solving-automotive-performance-issues
Keep us posted on your progress.
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