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Discussion Starter #1
The "check engine" light just came on on our '06 Elise. Immediately think of the oxygen sensors. I saw mention by one vendor that the Lambda sensor (which I think is the post cat. O2 sensor?) is prone to failure after a few years.

I saw also in a '13 thread that there are two sensors, one before and one after the cat.

What is the experience since then?

I checked with Rock Auto and they had no listing. What sources have any of you used to get the sensors. I presume they would be Bosch or Nippo Denso?

Would like to sort this out before going to LOG 39
 

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I think best to pull and provide us the code so we can better assist you. It could be as simple as loose gas cap and just overthinking the situation. Take it to Autozone if you don’t have a code reader.


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Discussion Starter #5
Had checked the code but wanted to confirm with my son that it was PO601 which, I understand from googling the code meaning, normally infers problems with the ECU. So, looks like the O2 sensors are not involved.

We had cancelled the "check engine light" message and ran the car briefly tonight without the message coming back. He will drive the car to work tomorrow (total 50 km or 30 miles) to see what happens. Thinking back, we had the Elise at a car show on Sunday and there was some trouble starting which related to the battery ground shut-off switch being slightly loose. Light came on when the car was started the second time at the in-laws after supper.

So, we'll keep our fingers crossed that the ECU got a little upset with low voltage to it at start-up maybe? Battery voltage with engine off was 13.3. Attached a Battery Tender and it started to get up to charge quite quickly. Battery is only one year old.

Any experiences or comments?

Thanks for suggesting I look into it further with a scanner.
 

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on the 2005 cars, this code means that there was a checksum error detected when loading the saved learned parameters. in that case, i would guess it to be related to the battery ground and cranking. maybe it's the same for the 2006 elise.

if it does not come back, then i would recommend not worrying about it.
 

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I don't remember the codes but my Elise has thrown two codes over the years.

1) Oxygen sensor - had it replaced
2) Dirty MAF - just needed cleaning
 
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