PATRICKPBME

I have a 2003 3.2 TL. Autozone ran a test after my check engine came on. Came up as O2 sensor. Thought I might replace myself with the help of this wonderful forum but now I am confused. Autozone had the parts in stock and indicated there were two O2 sensors, one on each side of the cat converter. Price for both was $100 +/-. However, when I got on the forum this morning and did a search, posts seem to say there are actually 4 sensors. Going on Rock Auto the price for the two listed was $200+. Assuming I can figure out where they are and replace, do I need two or four and why the difference in the prices I find?

Thanks in advance.

Iggy

There are only two in these cars. Bank one sensor 1(upstream pre CAT) and bank one sensor 2(Downstream mid CAT). What was the code?

justnspace

iTrader: (1)

the 3rd gen TL starting in 2004 had 4 O2 sensors.

horseshoez

iTrader: (2)

Interesting, I had always assumed my 2001 V6 Accord (same basic car as the 2G TL) had three O2 sensors; two upstream (one from each side of the engine), and one downstream. That said, I don't believe I've ever looked; nice to know.

PATRICKPBME

The printout tells me "P0131 HO2s-11 (Bank 1 Sensor 1) Circuit Low Input

Thanks!

horseshoez

iTrader: (2)

When you buy your now O2 sensor, do not under any circumstances buy a Bosch sensor; they have a notoriously high failure rate. Instead, buy either an OEM Honda sensor or a Denso unit.

PATRICKPBME

The printout tells me "P0131 HO2s-11 (Bank 1 Sensor 1) Circuit Low Input

Thanks!

Station

I had the same CEL not long ago so I ended up ordering both sensors since my car has 175k miles

Denso 234-4621 (for down stream)
https://www.amazon.com/gp/aw/d/B000C5YCUM?psc=1&ref=yo_pop_mb_pd_title

Denso 234-4727 Oxygen Sensor (for upstream)
https://www.amazon.com/gp/aw/d/B000C5YD1U?psc=1&ref=yo_pop_mb_pd_title

The upstream one was a bitch to disconnect the plug from the top but it can be done. I think I used a 7/8" wrench to get them off. The downstream plug on the cat was pretty seized so I got it loose by tapping the wrench with a hammer. Apply the anti seize that comes with the plugs to the threads and your good to go, just make sure you only get the anti seize on the threads.

PATRICKPBME

Not implying any correlation, but just put new tires on the front...and the check engine light went off.

losiglow

iTrader: (1)

I'm not sure if Bosch makes bad sensors or if Honda's/Acura's just don't play nice with them. But they're notorious for failing or at the least, not working correctly in Honda products. Definitely OEM (which is a Denso anyways I think....). Some might think that would be a no brainer but I can nearly guarantee that if you go into an auto parts store, they'll likely pull up a Bosch when looking up the O2 sensor.

horseshoez

iTrader: (2)

I've run into issues with Bosch O2 sensors on Hondas, Toyotas, Chryslers, Mazdas, and BMWs. Not sure why so many cars don't like their sensors, but in each of those cases, Denso senors work.

Station

My CEL light would go off and come back on periodically as well. I figured there was a loose wire on one of the sensors but replaced them anyway. No CEL for the past couple of months since I replaced them.