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Greetings and salutations everyone. I’m back with a new problem. Over a month ago, i got a code P0140, which is the O2 sensor2, in my 2006 Kia Rio. I replaced it and the engine warning light disappeared. Yesterday, warning light illuminated again and showing P0140 again. The sensor i am talking about is the one that is under the car and near the catalytic converter. Am i looking at a wiring problem here or loose plug or something else? My gas mileage seems fine and no other symptoms noticed. Please help a NOOB DIY mechanic. Thanks in advance.
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The one after your converter.
A P0140 is no signal from the sensor at all, so either the new sensor is bad, the connector is gummed up, or you have a wireing issue.You are right, No Activity Detected. If i change the wiring and the plug. Is it simple to pull out? From the sensor itself, where does the wire lead?
The very first thing I would check is the fuses for the oxygen sensors. There are 2 of them. 1 in the underhood fuse box and the other in the passenger compartment by your leg. IDK which is for the rear o2 sensor, so check both unless you have a manual detailing which is which. They are each labeled SENSOR
Yes,
It could be a faulty replacement sensor too.
There’s a how to on checking the wiring here http://www.justanswer.com/kia/7kip7-kia-rio-lx-2006-kia-rio-showing-mil.htmlFew questions….
1. Do i check the Sensor with voltmeter too for refund or exhange?
2. Can i just replace both end of the connector?
3. If the wire itself is the culprit, is it replaceable, isnt it bunch up with other wirings too?
4. Where is other end of the wiring lead to (fuse box, battery…etc.)?The link I provided has tests for the connector, the wiring and the sensor itself.
If you read the link, you’ll see that there is a resistance test using the ohms testing part of your digital multimeter.
That’s the only test needed on the sensor itself.
The linked page walks you through each step.
Note that the tech there says to only use Denso sensors, as his experience with Bosch sensors was reported as too many being bad.[quote=”terryf” post=173854]Few questions….
1. Do i check the Sensor with voltmeter too for refund or exhange?
2. Can i just replace both end of the connector?
3. If the wire itself is the culprit, is it replaceable, isnt it bunch up with other wirings too?
4. Where is other end of the wiring lead to (fuse box, battery…etc.)?[/quote]1. Do i check the Sensor with voltmeter too for refund or exhange?
I dont under stand the question??2. Can i just replace both end of the connector?
the wireing should be going to the computer along with a bunch of other wires3. If the wire itself is the culprit, is it replaceable, isnt it bunch up with other wirings too?
you can if you want to but I woiuld first make sure its good or bad4. Where is other end of the wiring lead to (fuse box, battery…etc.)
prity much answerd it in #2I drove the car to work this morning. The warning light was on. In the afternoon after starting the engine, no more warning light. What does that mean? Should i just wait until the light pop up again?
O2 sensors gets a lot of blame, even from the ECU. But when you think about it, it´s the last piece in the foodchain. Basically everything that goes on in an engine happens before. If you have a vacuum leak, who gets the blame when the ECU can´t figure out the proper mixture ? Right… the O2 sensor.
If you have changed the O2 sensor, measured out the circuit for the sensor, if the fault still shows up, it´s not the O2 sensor. It just takes the blame. You need to examine basically everything that happens BEFORE the O2 sensor.
Crazed sounds right because the code is saying Inactivity. If its something else, it should be a different code but im not sure. Also i forgot to mention, before the 2nd incident happened, i put 1 bottle of Lukas injector cleaner in my full tank. Does it trigger warning light temporarily hence there is no more warning light at this time? It went away by itself.
A wireing problem could very well be intermittent, now that it is off you could try to climb under the car and wiggle the wire around and see if it throws the light back on.
This is because if the wire is broken just a little and moved the right way to make connection again or is could be grounding in the frame and then moved off of it.I’ve never seen someone throw an 02 light with Lukas but theoretically it could change how the gasoline burns hence throwing a lean / rich code.
[quote=”CrazedAssassin” post=173980]A wireing problem could very well be intermittent, now that it is off you could try to climb under the car and wiggle the wire around and see if it throws the light back on.
This is because if the wire is broken just a little and moved the right way to make connection again or is could be grounding in the frame and then moved off of it.I’ve never seen someone throw an 02 light with Lukas but theoretically it could change how the gasoline burns hence throwing a lean / rich code.[/quote]
FYI trying to wiggle the wires might not kick the check engine light…. car might have to be at operating tempture before it ask for data from the o2… so it might not even be looking at it… if you have a scan tool that has live data that might work… but I would probly back probe it and see if your seeing some signal… that will not tell you if the o2 is good or bad but can give you an idea… even with an o-scope you cant tell if its good or bad you have to connect an scan tool to check it…. but if its not reading data at all then your should be able to see it not showing it….
FYI… if you have never pulled a o2 off… run the car get it hot turn it off and use a specail socket to remove it…. you also might need a popan touch too… the specal sock can be rented at most auto part stores…
if its not reading from both bank 1 and 2 then you probly have a wireing issue but make sure you have scanner tool config correctly and you have 2 o2’s in the car… o2’s are uselly like $25 or so,,, not to bad and sorta easy to replace… just handle them with care they brake easyly
FYI put some anti seize on the treads when installing it, just dont get any on the tip
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