Replacing the O2

I'm having trouble with my engine check light and O2 sensor because I have a high flow cat. So I called a local parts store, and they said a new secondary O2 sensor would cost me $1000 canadian. That would be about $600 US. Can this be correct? If so, why so much?

dude call and price one somewhere else...thier not even that much at a dealership....holy cow thats expensive...sheesh...


gunnmen01

I just got a new Bosch O2 sensor at the local auto parts store for $40, I estimate that to be like $60 canadian.

Ok, that acctually helps a lot. Thanks

Question #2

The reason I'm thinking of replacing my O2 is because I have a high-flow cat which has caused me to move sensor #2 (upstream) thus (after a few months) causing the check light to come on. I went to Honda to have the error code cleared, but after a little while the engine check light came back on. What should I do? Should I just get a new O2 and see what happens? Should I find a way to move the O2 downstream a little? Or should I just get a better high-flow cat (the one I have is only worth about $75 US)?

Question #3

Does anyone know why my engine light came on?

im still stuck on why you had to move your O2 sensor to install a high-flow cat. i guess i dont know enough about OBDII setups...:rolleyes: makes me happy i have OBDI :D .

if there is one after the housing, and you moved it before the cat, then your answer is right there. the sensor is not finding a change in the gasses, so it assumes the cat is gone and trips the light so you fix it. moving it down the line should solve it, if the high-flow is able to work about as well as the stock one.

A new O2 sensor wont fix the problem. The reason your check engine light is coming is because its checking to see if the converter is working or not. Since you moved it upstream its getting the same reading on both sensor and thinks your converter is not doing its job... Atleast thats my guess. The only way you could fix it is to find a way to put the sensor in the converter or after the converter maybe.....once again this is just my opinion...


gunnmen01

That makes sense. Thanks for the advice. I'll find a way to move it downstream.

Only 1 more question. The high-flow cat really doesn't look much like a stock cat. Instead of having what looks like a bunch of filters, it is basically just a straight through pipe with little perforations on the inside (like a resonator). So I'm still wondering wether or not the high-flow cat with behave like a stock one.

Does anyone have any experience with high-flow cats?

O2 sensor simulators about $50 us. fast and easy.

http://www.zzperformance.com/zzp/products/prod_o2_simulator.htm


O2 sensor Simulator: Eliminate the Testpipe CEL --------------------------------------------------------------------------------
from Hondata Tech
OBD II engines use one oxygen sensor before the catalytic converter, and one oxygen sensor after the catalytic converter. The function of the second oxygen sensor is to determine if the catalytic converter is functioning. It does this by looking at the difference between the two oxygen sensors. If the catalytic converter is functioning correctly there will be a reduction in the exhaust oxygen content as carbon monoxide and carbon dioxide is catalysed in the converter.
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ECG Electronics now has an OBD2 O2 sensor simulator you splice into the second oxygen sensor line and bingo! no more check engine light. Not bad for 45 bucks.


quote:
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Unlike, most O2 simulators on the web that use a 555 timer, the O2Sim utilizes a RISC processor to exactly simulate the oxygen sensor outputs from the catalytic converter. This eliminates check engine light problems common with high flow catalytic convertors and test-pipes! The O2Sim computes various vehicle sensor parameters in real-time to mimic the oxygen sensor outputs.
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These guys charge $45 for them:

http://www.diabloautosports.com/product_info.php?cPath=&products_id=2198&PHPSESSID=

Great post Stefan! That really helped a lot. Thanks.

hey let me know how much you get outta that test pipe. I was thinking about doing it. In fact, i put a high flow cat in and took it out cause of the check engine light.

You will only gain minimal ammount of Hp at the top end, but you will lose some torque at the low end due to the high flow or test pipe. I will only recoment that if you go to the track and race and not for street use. For street use you need the torque more than the top end Hp. But again, this just my oppinion. Good luck. stefan525

I'd rather have high-end hp on the track and the street.

Wow thats expensive. Have you tried websites?? Do you have a autozone availible, if not try that finding autozones website!

Originally posted by stefan525
O2 sensor simulators about $50 us. fast and easy.

I've heard about these, but haven't purchased one yet. I suppose this will work the same on a turbocharged motor?