S2000 Under The Hood S2000 Technical and Mechanical discussions.

CEL + No Code?

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Old Dec 20, 2017 | 01:09 PM
  #11  
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Originally Posted by Sexi2k
I suspect it may be a bad ECU. Going to remove and inspect for visual damage.
Not sure why you’re suspecting this now unless you just read the earlier link I referenced. Thought you already read up on all the posts related to your CEL...

Based on my research, it’s probably a faulty connection at the o2 sensor or ecm. There also seems to be a specific drive cycle related to that o2 sensor code. Given that you tried the earlier drive cycle suggestion in this thread, I’m guessing you havn’t driven the 50 miles (at least) yet.
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Old Dec 20, 2017 | 02:30 PM
  #12  
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Originally Posted by Midnightdennis
Not sure why you’re suspecting this now unless you just read the earlier link I referenced. Thought you already read up on all the posts related to your CEL...

Based on my research, it’s probably a faulty connection at the o2 sensor or ecm. There also seems to be a specific drive cycle related to that o2 sensor code. Given that you tried the earlier drive cycle suggestion in this thread, I’m guessing you havn’t driven the 50 miles (at least) yet.
Didn't realize it was in that thread, found that ECU might be an issue from honda tech forums. Probably missed it from frantically searching for an answer.

Drove the car about 10 miles today. I'll take a 50 mile freeway drive tomorrow to see if that solves it.

Thanks for your help.
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Old Dec 23, 2017 | 02:51 PM
  #13  
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Quick update: Brought the car to Honda and they couldn't scan any codes either. It's narrowed down to the ECU now.
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Old Dec 25, 2017 | 05:07 AM
  #14  
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You brought it to Honda, and without doing any real diagnosis, they want to change the most expensive possible component, and hope it fixes the problem?

Prepare to bend over, and stay bent, as they proceed to charge you more and more as each thing they try fails to fix the issue.

If it were, say, a faulty connector in the o2 harness, as one post here suggested, you know how a pocal mechanic would fix that? They'd replace o2 sensor to fix that end of connection, and cut off the connector from cars harness and solder in a new one for the other end.

You know how a dealer fixes such a problem? They replace the whole harness. If that harness is huge, intricate, there is a lot of disassembly all over the car. That could cost many thousands. Thats on top of the 1k+ they're going to charge for the ecu.
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Old Dec 28, 2017 | 11:23 AM
  #15  
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Originally Posted by Car Analogy
You brought it to Honda, and without doing any real diagnosis, they want to change the most expensive possible component, and hope it fixes the problem?

Prepare to bend over, and stay bent, as they proceed to charge you more and more as each thing they try fails to fix the issue.

If it were, say, a faulty connector in the o2 harness, as one post here suggested, you know how a pocal mechanic would fix that? They'd replace o2 sensor to fix that end of connection, and cut off the connector from cars harness and solder in a new one for the other end.

You know how a dealer fixes such a problem? They replace the whole harness. If that harness is huge, intricate, there is a lot of disassembly all over the car. That could cost many thousands. Thats on top of the 1k+ they're going to charge for the ecu.
Sorry, I forgot to mention my friend works at Honda so I got to use the scanner free of charge. It pulled no DTC codes either, so we concluded it was the ECU. I ordered a used one and the light remains on, after about 10 seconds with ignition in ON position.

Talked to a service advisor at Honda and they want $161 just to find the origin of the code.

I really don't want to bring it in but it doesn't look like there's anything else I can do. Don't know if this could cause a CEL but I have an 08 09 cluster on my 04. Also, the dash controls are not plugged in as I'm working with swapping the cluster after smog.
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