replaced o2, still getting code

[theSOB]

after install i pulled both ecu fuses for about a minute. replaced and drove for about 10 mins. codes returned and i rechecked. still getting code 41. i have the f22a1 with h23 im and pt6 ecu. the o2 sensor location is on one of the four runners on my header (like dc sports). the stock location is at the collector where all four come together. could that cause a read error? i purchased an exacted replacement for the f22a1, delco brand. any info would be awesome, thanks!

[nine_deuce]

You may have a bad ecu. I had the same problem, was throwing an o2 sensor code, bought a new o2 sensor, put it in, reset my ecu, started my car, check engine light came back on.

My light would come on almost immediately after starting my car, I read in a manual that the o2 sensor doesn't even send a signal to the ecu until it reaches a certain temp, don't remember what that is right off hand, it was over 1,000 degrees or something crazy.

I'd say, swap ecu's and see if that solves the problem

[theSOB]

You may have a bad ecu. I had the same problem, was throwing an o2 sensor code, bought a new o2 sensor, put it in, reset my ecu, started my car, check engine light came back on.

My light would come on almost immediately after starting my car, I read in a manual that the o2 sensor doesn't even send a signal to the ecu until it reaches a certain temp, don't remember what that is right off hand, it was over 1,000 degrees or something crazy.

I'd say, swap ecu's and see if that solves the problem

i may try. i know that i saw the cel when i still had the pt3 in it. so tht would just be a weird coincidence. i'll try tomorrow

[deevergote]

The ECU is not likely the case. A bad ECU would give a solid CEL.

It's entirely possible that the o2 sensor just isn't right. The ONLY brands that are guaranteed to work properly are NGK/NTK or Denso. Bosch sensors are known to work improperly straight out of the box. Bosch invented the o2 sensor, so chances are most other brands are copies of that design.

[bcjammerx]

The ECU is not likely the case. A bad ECU would give a solid CEL.

It's entirely possible that the o2 sensor just isn't right. The ONLY brands that are guaranteed to work properly are NGK/NTK or Denso. Bosch sensors are known to work improperly straight out of the box. Bosch invented the o2 sensor, so chances are most other brands are copies of that design.

I've personally seen 4 brand new bosch spark plugs be bad RIGHT from the box...2 on mine, the other 2 on a customers car...I will not buy bosch anything ever...horrid track record.

[deevergote]

I've also had issues with Bosch plugs.

Bosch may be good for some cars, but Hondas don't seem to be among them. I couldn't tell you why, but there are too many Bosch failures to simply be coincidence.

[nine_deuce]

I didn't mean a bad ecu, I meant the plug or whatever on the ecu that controls the o2 sensor may be bad.

But yeah, if you tried a different ecu, that probably isn't the problem

[theSOB]

The ECU is not likely the case. A bad ECU would give a solid CEL.

It's entirely possible that the o2 sensor just isn't right. The ONLY brands that are guaranteed to work properly are NGK/NTK or Denso. Bosch sensors are known to work improperly straight out of the box. Bosch invented the o2 sensor, so chances are most other brands are copies of that design.

the new o2 sensor is a Denso. That's what confuses me. i made sure i bought a good brand

[deevergote]

Ah, ok. In your first post you say "delco", as in GM parts.

In that case, do what was mentioned above and check all wiring to make sure connections are correct.

Also, did you reset the ECU afterward? It could just be throwing the old code because you never reset it.

[wed3k]

heater circuit...

check continuity of the wires, A6 and A23. also make sure the Pcm is giving out battery voltage for the heater.

[theSOB]

Ah, ok. In your first post you say "delco", as in GM parts.

In that case, do what was mentioned above and check all wiring to make sure connections are correct.

Also, did you reset the ECU afterward? It could just be throwing the old code because you never reset it.

ha wow, i cant believe i did that. but ya i did reset the ecu. i pulled both ecu fuses for about a minute and replaced them. now when i drive the ecu doesnt ever seem to store codes. fuses are still good but every time i start my car there is no cel. but after driving for a while the light comes on.