My car isn't running so great and it threw a p0134 code which is for the 1st o2 sensor. I'm thinking maybe we messed up the sensor when we heated it to get it out of the old o2 housing.

The car likes to rev up to 3k rpm and stay there for a little, then it will drop back down to normal idle. It will do this at random times when I drive. I cleared the code once, but it hasn't come back on yet. But i only driven the car maybe 15miles since clearing it.....

Does this sound like something the car would be doing on a bad o2 sensor?

 

nobody knows?

today when i was driving home from work the car would go down to 500rpms like it wanted to stall. car seems to be running really rich also.

 

Yes the front o2 controls the afr. There is a test on how to determine if your o2 sensor is bad in the evo tech manuals that someone printed out on here. I know I had to replace mine on my old evo and bought a universal o2 sensor from advance and spliced it in.

 

i would like to know if anyone could tell me the test because these sensors arent the cheapest

 

Do a search on here. That is where I got the OEM trouble shooting tips for an o2 sensor. I can't remember but it involved checking the resistance and some other things. I think my o2 heater was bad. It has been a while so I cannot remember. If you throw another code, chances are the sensor is bad. You have already reported poor idle.

 

i havent thrown a new code since i erased it. the p0134 code is o2 sensor(b1,s1)no activity.

i dont know how i could even get that code in the first place if the sensor wasnt bad. i need to get the car retuned. and i want to make sure the sensor is good before it gets tuned

 

Well the front o2 controls your afr while cruising and idling around. Drive your car around some more and if it continues with idling and cruising issues, chances are you need a new o2. A oem mitsu o2 sensor was like 300$+ last time I looked it up and thats why I got a universal for 80 I think...

 

Does the car stall or just have a bad idle? The sensors aren't that expensive I got mine for like $75 brand new.

 

when i drive the car, at sometimes, it like to just rev to 3000 rpms for no reason. it will stay there from 30sec all the way to a couple minutes.... then it will go down to around 1000rpm.

today when i was coming home from work, it didnt rev high. but when i was in a little bit of stop and go traffic, the car would drop to around 450-500rpm. i would give it gas, just because i thought it might stall. im not sure if it actually would have tho

 

Do you have a wideband? You can check if you have erratic afr readings.

 

it could possibly be your iac as well

 

wideband is currently out of order.lol. wires got cut by my alternator. but when it was reading, the afr didnt seem to stable

how can i check my IAC? i know they arent cheap either

 

http://www.discounto2sensor.com/stor...967173&PN=2219

Part Number: NP2344741

 

i can get a denso at a auto parts store here for 75 bucks. i guess ill just replace it tomorrow and see what happens

 

make sure the downpipe is on right also and the donut is sealing the exhaust