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Old 05-09-2015, 06:13 AM   #1
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O2 sensor CEL after DE day

I ran my first DE track day yesterday - what a blast to really see what these cars can do! Car ran well during the event (other than cooking the old brake fluid - lesson learned, change the brake fluid before the next DE!)

While driving the 2 hours home, after about 90 minutes of highway driving, I hit stop and go traffic and got a CEL light.

I checked the fault codes this morning and they were all O2 sensor issues. I reset them and the codes have not come back (yet).

Any ideas of what would cause the CEL in the first place?

Thx-

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Old 05-09-2015, 06:45 AM   #2
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Depends upon what codes you observed.
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Old 05-09-2015, 08:34 AM   #3
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I had the same thing happen a couple years ago. I ran it hard on Nürburgring and then flew it home at constantly over 100 mph for 1.5 hours. At the 1st stop sign, a CEL popped for an O2 sensor. Reset it and it stayed off for about a year until my MAF sensor took a poop on me.
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Old 05-09-2015, 08:40 AM   #4
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Codes were:
P1602
P1123 - code 27, lean
P1125 - code 35, lean
P1130 - code 34, lean
P1128 - code 26, enrich
P1276 - code 22, below low limit
P0159 - code 23
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Old 05-09-2015, 12:57 PM   #5
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Quote:
Originally Posted by brewerbry View Post
Codes were:
P1602
P1123 - code 27, lean
P1125 - code 35, lean
P1130 - code 34, lean
P1128 - code 26, enrich
P1276 - code 22, below low limit
P0159 - code 23
Year and model of the car?
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Old 05-09-2015, 02:30 PM   #6
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1997 boxster with 2.5l tip, w/under drive pulley and low temp thermostat - rest is stock for now.

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