Passat (B5) :: DTC P0422 - How To Test O2 Sensors
Jan 26, 2010
I have a 1998 Passat 1.8 T with 137k miles on it that has been throwing the P0422 code. I've reset it at Schuck's and it has come back. Car is running fine and no rattle in the catalytic converter. Although it could still be the cat, it could just as well be something with the O2 sensors. Don't have a VAG-COM tool to check them directly. Is there some way other way to determine which O2 sensor it might be and/or if it is really the cat?
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How to test reverse warning system sensors? My truck about 75% of the time, once i put it in reverse the system goes to off. I assumed a sensor, but can't find any major resistance differences in them.
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I have a 1998 1.8T Passat, Manual, with a P0422 DTC which always comes back after resetting. I don't have a Ross Tech since I own an older Mac. I have also sensed a more than usual odor from the exhaust and I have had a very noticeable loss in power at times.
The mechanic took a look at it and said that the cat was rattling and possibly partially plugging the exhaust system. He has ordered a new one for me - it will be here in couple of days. About 15 mins after I drove away from the shop (check engine light still on), I was accelerating away from the light and I felt a gentle jerk in the car and the power and acceleration and power that we all love in the 1.8T came totally back. It feels like a new car again. You really don't realize what you had missing until it comes back.
Does this make sense? Is this consistent with a the "plugging/unplugging" of an exhaust system by a bad cat? I just want to make sure the mechanic is doing the right thing.
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My 1999 VW Passat has a check engine P0411, P0422, so I looked for any damaged vacuum lines and found one that was all melted coming out of the blue vacuum reservoir tank in the front left lower bumper area. The line was broken off and I cannot figure out where this line is supposed to go.
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I recently failed emission test for my 1999 V6 Passat. I replaced the cats., thermostat, O2 sensors (before cats), and the list goes on. Is there a reflash in the ECM that needs to be reset that only VW can do with their scanner?
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How to clear the check engine light on 2000 Passat 4motion Wagon?
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What's the quickest way to check if the Check Engline Light is working?
I took my passat to get apr chipped. The shop spent few hours, and even worked with APR, and they could not figure what the issue is.
They were able to upload the software fine, but couldn't figure out which mode it is in, as they say my CEL isn't flashing, and therefore unable to switch modes.
APR got the shop to flash back the original software, and had them do a 'test'. I was told they tried unplugging a sensor, and the CEL didn't show, and made the conclusion that there is an issue with my ECU, which got me worried.
I am guessing they unplugged the MAF, as it is the easiest/closest sensor to unplug. And from what I read, it might not throw a CEL. In addition, APR's website state some B6 Passat Auto only support 1 mode.
Is there any easy way to test if my CEL is working or not? It lights up for a quick sec when I start the car, so I know it is not a fuse or bulb issue. Could it really be my ECU that is faulty? or is my ECU working ok, but only support 1 mode?
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The 2012 PASSAT has the built in facility to operate the winsdcreen wipers and adjust the rear view mirror for bright lights. Why delivery cars having this function enabled? Dealer outright refuses to activate them, even though they appear to be the exact same as in the 2012 EOS.
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So I just installed a new set of brakes on the front end of my car.
Every once in a while now the sensor trips and I get that lovely yellow circle image on my dash.
The pads are BRAND NEW! I clipped the sensors into their spot once I installed the pads. Should I tape them down?
Other than the wire connection between the pad and the car... what could be tripping this light?
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I have only had my car for about a month and i just realized that my wipers don't work. The mist setting, and constant 1 and 2 work also. But when i set it to the rain sensing mode and move the lever either way it will not work even in a down pore.
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What speakers do the Parking Sensors use? Do they have their own?
If you replace the radio head unit with an Aftermarket one, do you lose the Parking Sensor beeps....?
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Looking for the right VAGCOM procedure to disable the brake sensors? I replace my brakes and the new ones didn't have the sensors. Now I get the nice "Brakes Low Warning".
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what are the common problems that cause the rain sensors to not work. The speed one and two both work, but when i set it to auto the wiper will work one time but then never again. when i move the sensitivity switch to the left and then back to the right it will work once more.
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2007 Passat wagon with TPMS. Getting new sensors and a set of winter tires and wheels.
Can I ad the new sensors the my Passat using a VagCom or some other method?
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Purchasing snow tires with OEM rims and trying not to have to purchase a new set of wheel pressure sensors - hence my question: Can the wheel air pressure sensor alert be disabled to do away with that nagging info?
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Just as it states...The Rain sensor is working because my rear wiper turns on but the front wont even turn on with the switch?
2007 Wagon....
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I have been trowing a P0422 code which is main catalyst below efficiency.
I recently changed the rear o2 sensor and about 60 miles later the same code came back.
Logic dictates that the Cat is bad or there is an air fuel issue. No other codes have been thrown.
The car is a 1999 Jetta 2.0L AEG engine but it only has 51k miles on it. Would the cat go bad in 51k miles?
What else could I be looking at?
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My 2000 Hyundai Accent Hatchback (manual) is tripping the code P0422 (Main Catalyst Efficiency Below Threshold (Bank 1)). If i clear the code it will pop back up after about 40-60 miles of driving. I hooked my OBDII sensor to it and look at the voltage output from the two O2 sensors and the front one oscillates between .2 to .7V and the downstream one does as well switching about at the rate. From my understanding the downstream O2 sensor should stay fairly steady or at least switch much slower than the upstream one. I get pretty good gas mileage, typ. ~30mpg. Luckily my state does not have emission testing. Is it actually the catalytic converter, the downstream O2 sensor or something else?
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A few months ago I had multiple misfires due to a failed coil. When it happened I drove it enough to get to an Advance auto to have the code checked that came up. After I replaced the coil the car ran fine, but then the engine light came on with the P0422 bank 1 code. Does this mean the manifold cat converter is shot? The car runs fine except for what feels like the transmission trying to decide where it wants to be around 40mph (like it's shifting back and forth, don't know if it's related). I have a flex pipe that is leaking and needs replaced. I haven't noticed any loss in MPGs (consistently 26mpg city since I started checking). I have 133k miles.
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Has around 173,000 miles, with a fresh cat installed a couple hundred miles ago. I was getting this code before, that is why I had a new cat installed. The code finally came back, and just recently I had to replace the crankshaft position sensor. After the sensor change, it was running great. The CEL came back on during a rainy day, I cleared it and was good for a few days. Then it rained again, and it came back. I couldn't afford a new OEM cat, I grabbed the best rated one I could from Amazon and had a shop install it. I know non OEM can be an issue, but I hope it is just an O2 sensor going bad.
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I have a 2001 Elantra GLS, 160,000 miles. These two codes come up on ny diagnostic tool.
P0422
Main catalyst efficiency below threshold (bank 1)
No symptoms at all
P1529
Customer snapshot request
Symptoms
Car will shift hard into third gear and stay there without shifting at all regardless of speed. Shutting the car off and restarting will sometimes fix, but only temporary. When car runs normal, it runs fine and shifts good. At speeds around 40 it seems to kick back and forth between 3rd and overdrive as if it can't decide where to be. Tried replacing speed sensor, but new sensor did not fix problem.
Fuel Sys 1 CL
Fuel Sys 2 NA
Calc Load 18.4
ECT 201
STFT B1 0.0
LTFT B1 -2.3
MAP 8.6
Eng RPM 3351
Veh Speed 22
EV flashing
O flashing
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