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Old 01-14-2023, 06:07 AM   #11
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I'm leaning towards the primary O2 sensor. Had this happen on my 04 Civic and replaced with a Denso one. Secondary one is still running good. Roughly have 40,000 on the new one and haven't had a problem yet.
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Old 01-14-2023, 08:13 PM   #12
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I'm leaning towards the primary O2 sensor. Had this happen on my 04 Civic and replaced with a Denso one. Secondary one is still running good. Roughly have 40,000 on the new one and haven't had a problem yet.
OK, appreciate this input.

Are you talking the first one on the cat? Right?
I know there are 2, I've seen them both. Is there any other O2 sensor(s) I don't know about?
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Quote:
Originally Posted by Deerhurst
What he is saying is the aerodynamics of a D21 is a brick in the wind.
Probably at least as bad as a Jeep so worse than a cow.

-"No electrons were harmed during the creation, transmission or reading of this posting.
However, many were excited and some may have enjoyed the experience."
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Old 01-14-2023, 10:20 PM   #13
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Originally Posted by 89'HBV6 View Post
OK, appreciate this input.

Are you talking the first one on the cat? Right?
I know there are 2, I've seen them both. Is there any other O2 sensor(s) I don't know about?
Yes the first one or what they call upstream. On my civic it was by the exhaust manifold since the cat is integrated into it.
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Old 01-14-2023, 10:24 PM   #14
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10-4...
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Quote:
Originally Posted by Deerhurst
What he is saying is the aerodynamics of a D21 is a brick in the wind.
Probably at least as bad as a Jeep so worse than a cow.

-"No electrons were harmed during the creation, transmission or reading of this posting.
However, many were excited and some may have enjoyed the experience."
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Old 01-24-2023, 06:16 PM   #15
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Does the fsm have instructions on testing the o2(s) with a multimeter?
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Old 01-24-2023, 06:47 PM   #16
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Could not tell you... have an appt with my mech on Thurs. Checking fuel pressure and replacing the upstream O2. I suspect the current sensor is nasty, in that cat. I'll get a PIC on Thursday... Currently working on tank #2 with FI cleaner.

This is the wife's daily driver, I just reset it when it codes and hope to keep it running for another year or 2, till we can afford to replace it. But it still gets the best MPG of anything with 4 wheels, on our property. Just can't beat the 50+ I get on the KZ...
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Quote:
Originally Posted by Deerhurst
What he is saying is the aerodynamics of a D21 is a brick in the wind.
Probably at least as bad as a Jeep so worse than a cow.

-"No electrons were harmed during the creation, transmission or reading of this posting.
However, many were excited and some may have enjoyed the experience."
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Old 01-25-2023, 04:39 AM   #17
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Quote:
Originally Posted by 89'HBV6 View Post
Could not tell you... have an appt with my mech on Thurs. Checking fuel pressure and replacing the upstream O2. I suspect the current sensor is nasty, in that cat. I'll get a PIC on Thursday... Currently working on tank #2 with FI cleaner.

This is the wife's daily driver, I just reset it when it codes and hope to keep it running for another year or 2, till we can afford to replace it. But it still gets the best MPG of anything with 4 wheels, on our property. Just can't beat the 50+ I get on the KZ...
It’s good to be an “informed consumer” when it’s shop time. Fingers crossed for you it’s just the o2!

I feel you on two wheeler supremacy, I have a little cb350 I’ve been slow rolling on that is finally “sorted” enough to commute on and it’s been great.
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Old 01-26-2023, 01:05 AM   #18
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I found a good mech... but we've talked and he doesn't want to touch the D21. He already had a bad (previous) experience...

Yes, informed is always a good thing. This is the reason I refuse to take this car back to a dealer. The car is only worth ~$3k... but gets decent mileage. The wife wants another Subie. <sigh>
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Quote:
Originally Posted by Deerhurst
What he is saying is the aerodynamics of a D21 is a brick in the wind.
Probably at least as bad as a Jeep so worse than a cow.

-"No electrons were harmed during the creation, transmission or reading of this posting.
However, many were excited and some may have enjoyed the experience."
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Old 01-28-2023, 04:59 AM   #19
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OK, replaced the O2 sensor... think the old one (14 years!) got hot?



3.6ohms on the old one, 3.0 on the new one.

Noted to be a weak point on this car... I'll know more this week, once the car gets driven.
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Quote:
Originally Posted by Deerhurst
What he is saying is the aerodynamics of a D21 is a brick in the wind.
Probably at least as bad as a Jeep so worse than a cow.

-"No electrons were harmed during the creation, transmission or reading of this posting.
However, many were excited and some may have enjoyed the experience."

Last edited by 89'HBV6; 01-28-2023 at 05:19 AM.
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Old 01-28-2023, 09:57 AM   #20
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Good find!

Hope this fixes the issue. It does look like it got hot and melted some of the element off of it.
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