68 Malibu

Hi,
I've searched and not found testing instructions with this code - just folks replacing the O2 sensor. I want to double-check before I replace anything...

I have a 2005 Accord 4 cyl, auto with about 70K miles on it. About a month ago, the check engine light came on and code PO141 displayed. I think this is the downstream O2 sensor (tells the computer that the cat is working or not) and will have no impact in gas mileage/driveability. The light has been going on and off over the past few weeks.

I could easily replace that O2 sensor but want to see if there is something else I should check first. I don't want to spend money on the wrong part. Also, do you recommend spending extra money on the Honda sensor or is Bosch/Denso/other ok? Thanks for any help!

southie's civic

if moneys that big of a concern go get a used one at a junkyard for like 5-10 bucks ,.,., but its probably only 50 new at autozone and take u an hour to do that

DCFIVER

You test the rear O2 the same as the front. A scan tool would be best for the job, but a dmm,gmm, or scope will work the same with a little more effort...(FWIW, it does more than simply monitior the cat, it also plays a roll in fuel trim adjustments, albeit a small role)

Qfactor

no there not the front one is A/F ratio sensor not an oxygen sensor, the rear one is just an oxygen sensor.

DCFIVER

Ohhhhhhh right. Forgot about that.