acurazinefan

check engine light is on, went to autozone code was PO138, they try to remove/erase the code, after driving several miles CEL went back again. trying chevron w/ techron (fuel system cleaner) for now maybe there's some carbon deposits on the sensor i dont know?? would seafoam works??? any suggestions or remedies before replacing the oxygen sensor???

98 acura cl 2.3 stick with less than 90000

Master Bill Flex

P0138 - O2 Circuit High Voltage Bank 1 Sensor 2

If thats the case, its most likely just the aft cat 02 sensor.

i dont think there is a single chemical that can help anything in the exhaust. hows the car running? bad MPG may mean a clogged cat in some cases, which may throw off the code... im not sure, but if there is no difference what-so-ever, it may just be the rear o2 sensor. easy fix too

westwood167

Before you do anything, try the following
1. turn on the headlights
2. disconnect the battery and wait 15 minutes(leave the headlights on)
3. reattach the battery and start the engine

I have 99 5sp, the engine light stayed on even after I changed the O2 sensor, and the convertor. I even bought a OBD reader to reset it (worked for 1 day, then it came back on!)

The light has been off since I performed the above procedure 3 weeks ago

Good Luck!

acurazinefan

its all ok now no more check engine light !!!