Causes When Oxygen Sensor Replaced and Code Keeps Coming Back 

The plastic clip connection right? I tried pushing it in all the way and I feel that it might be my problem. I never felt a click and when I pulled it off it came off relatively easy compared to the one I replaced

Maybe a fuse??

Flex007 Basically it was ok except this video is suppose to be about a freaking p0038 code and NO OTHER CODE! This is a "heater side" issue on the O2 sensor. Yes wiring fuses relays can cause this issue but this can be simple to check just by plugging in a scanner and watching the "data stream" once you see the sensors working by see the numbers moving then you know the wiring and sensor is working. However one thing he didn't mention is if you DON'T have an OEM sensor then your sensor will not give out the right readings back to the computer needed to turn of your code. The other thing he said was that an exhaust leak can throw off the sensor reading which in the case of a leak after the catalytic converter wouldn't effect the downstream sensor. And you can pass inspection if you have all your exhaust pipes from the manifold including the cat. After the cat does not matter for inspection And if you had a leak before the cat your upstream O2 would be throwing a different code

I assume the leak would have to be BEFORE the 02 sensor like a cracked manifold.

thanks for this--- I'll be checking all my fuses and such as he recco. Much appreciated

Check vacuum leaks ( any air hoses on your engine that are leaking) also check your circuit. You pray to jesus it's not the catalytic converter.

Possibly vacuum leak

I jesili li rijesio taj problem?

Same. Did you ever figure this out?

@@dillon6320 was both O2 sensors but you have to recalibrate them aswell

It is hard to say, but a failed PCM is fairly rare. Wiring issues can be a pain and often hard to find. I would check for any exhaust leaks or a clogged catalytic converter. Many techs would swap out the sensors again with Denso sensors.

@HVAC_Mechanic well my cat is hollowed out and I had a o2 code after I did that and had to install a restriction adapter to the downstream and the light was off for years until about a month ago the o2 code came back and my upstream o2 was melted so I replaced both upstream and downstream with the adapter on the downstream still plugged them in cleared the codes and as soon as I started it there were codes for low voltage on both o2 sensors tried to clear the codes again and same thing but with them unplugged I drove the car for 30 miles or more without the engine light coming on but when it did come on finally with the o2's unplugged it said that I had a high voltage reading from the O2 sensors which I thought was very odd considering they were unplugged the wiring and everything looks intact I can't really find any breaks or rubbing marks on any of the wiring is it possible that I could have a relay doing this to me

Hi I'm just curious do you know the voltage output from the O2 plug on the harness I'm getting 829 volts on my multimeter but I'm saying that I should have 12 volts there

Yesss i had a huge hole in my throttle body air intake rubber.

Could it really be it

Did you fix the issue? I have the same issue. Had the P0420 code changed both cats, changed all 4 C02. Code for bad 02s came on the next day.

A bad 02 sensor should not cause the engine to run badly. The engine will not go into what is called a closed loop and be less responsive but should still run OK. I would look for other codes as there likely is another issue.

@@HVAC_Mechanic I'll go to autoZone and have them look at the codes again. if it's still bad after going to the mechanic on Monday I'm finding someone else :( it's making a tinny rattling noise from the passenger side of the engine now too. All these weird symptoms only started after they messed with the sensors. The codes before they changed the sensor the first time were P0137 P2097 Secondary P2270 I would like to fix it myself but I am beyond amateur and wouldn't be able to figure out what's wrong with it :(

A P0402 code is an issue with the EGR valve "Exhaust Gas Recirculation “A” Flow Excessive Detected". Here is a video on it ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-KAcaDElYKxU.html

If the 02 sensor is good, I would test the wiring next.

Let the code sit. Don’t reset. Drive it as you normally would. It’ll clear on its own after a couple days of normal driving.

@@markdavis8586 its been a about 2 months

Did you ever get an answer? I’m having the same issue

@@courtneywomack414 No! Not yet. Firestone told me to replace the TPS and use Mopar parts. I've been using after market parts. Waiting on a quote from them to put in a Morpar TPS, but I'm thinking, it all started from the cheap Chinese injectors I put in and might have them install the Chrysler OEM one's? Expecting a callback, and going to ask a quote for that. Probably gonna cost me $800? I have no cash, but, I have their C.C. which will make it easier to make payments. What brand of parts have you been using? I'll let you know if this solves my problem.

Never thought about changing your catalytic converters

@@TB12DAGOAT It was replaced about 2 year's ago, but I was thinking, maybe since my Jeep was running rich for about 6 weeks, may have clogged them? But I did replace all 4 O2 sensors. Thinking maybe time for Seafoam??? Update: I replaced the injectors with Chrysler OEM, and the Codes stopped, but still idling rough cold. TPS, MAP, IAC, Coil and plugs are new. Need to check plugs, may have gotten foiled, but don't think so in that short of time.

Maf sensor and or Map??

Most use a scan tool to clear the code and see if it returns. Often, a battery cable can also be removed, but this will also reset other things, such as the radio.

@@HVAC_MechanicI bought the sensor after the catalytic converter from BOSCH but the one before it I bought from another brand, would that be the reason I still have an error code on the sensor before the catalytic converter ?

@@HVAC_Mechanici already orded a new one from BOSCH as well, i'm waiting for the delivery.

I replaced with a Bosch should I have done a denso?