• The site migration is complete! Hopefully everything transferred properly from the multiple decades old software we were using before. If you notice any issues please let me know, thanks! Also, I'm still working on things like chatbox, etc so hopefully those will be working in the next week or two.

Check engine light on

CMURDAx

CMURDAx

New member
So over summer my car threw a code saying the bank 1 o2 sensor was bad. mileage was bout 10mpg. found out it was the one after the cat. changed it and everything was going smooth, mpg went normal. recently it threw the same code again and my milage didnt really get bad but not as good as it was. had it scanned said the same thing again. changed it last week, had the code erased, stayed off for a week with good milage. today light came on and i took it to autozone and it threw the same code again twice, said "bank 1 oxygen sensor below threshhold". would that be the o2 in the u-bend? this is the 3rd o2 sensor im on and dont wana drop $$ to have it happen again. heard a clogged cat could be eating the sensors. is there anyone who knows what o2 i need to change or how to unclog a cat beside buying a new dp?
 


u can take the dowpipe off and run a breaker bar or soemthing through the CAT and clear it out... do u have a aftermarket DP with high flow cat by chance?
 
when its dark outside... drive the car for awhile then look underneath and see if the DP/CAT is glowing.
 
ok so i just drove my car for bout 20 mins (it was already warm). headers werent glowing and neither was the dp/cat. i think its plugged but not bad becuase sometimes my car chugs along but not always. how hard is it to get your dp out?
 


pretty easy, if anything the bolts will be kinda hard to break loose.... if they are get some PB blaster and soak them down. 4 bolts total.. 2 up top 2 down below.
 
mkkk ill try this tommorow and hopefully itll help. so just take a bar and like jam it through and wiggle it around? no special techniques lol?
 
sensor 1 bank 2 is the sensor in the uben behind the cat. sensor1 bank 1 is the one on the downpipe behind the rear manifold.
 


on my list of obd2 codes there isnt one that states heated o2 sensor - below the threshold. what was the code that popped?
 
p0141 is your rear sensor, bank1 sensor 2. its the one in the ubend rigt behind the cant. i would check the fuse for the o2 to make sure its ok, should be a 10amp red fuse. then get under the car visually inspect the wiring harness around the sensor make sure nothing is showing or warn out. make sure the plug is set in all the way that code usually doesnt come up because of a clogged cat. its either a faulty sensor or a short in the system or bad fuse as i stated.
 
im gona have to check the fuse. the o2 is literally not even a week old. and the one before it was like 5months old. which box is it in, under the hood or in the glove box?
 


yea let us know and if i think of anything else ill let you know. oh and fyi just to let you know that rear sensor from auto zone is about 78dollars. and if you do end up replacing it again rent the o2 sensor wrench makes life easy :p
 
yeh this ones from autozone. last one was from murrays i think. ive mastered gettin em on and off with a regular wrench sadly
 
hey joe whats that fuse called? me and my dad looked in the manual and on the boxes and no "o2 fuse"
 
You must log in or register to reply here.
Back
Top