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CEL constant, then flashing at low RPM, High load.

 
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Old 12-25-2011, 09:57 PM
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CEL constant, then flashing at low RPM, High load.

So I took a $3k chance on a 1999 Prelude (130k miles). The seller told me that the check engine light was due to a bad o2 sensor, and she'd been driving for 3 months with the CEL. When I turn it on it, the CEL lights up steady, but sometime after traveling on the highway, at around 65 mph (3,000rpm - Low RPM/High Load), the CEL begins flashing, and stays flashing until I turn the car off. From what I understand, this is inline with what the seller told me - that the o2 sensor needs replacement. The gas mileage I was getting, was pretty bad, too - also inline with the o2 hypothesis. Of course, I won't know for sure, until I get it checked out, but my question is , could driving with a bad o2 sensor for a few months (as the seller did), damage the car? ..........The VTEC works fine, and there is no hint of valve noise.
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Old 12-26-2011, 12:48 AM
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Re: CEL constant, then flashing at low RPM, High load.

First concern when involving if your motor is running right or not - shouldn't be if you can engage vtec or not lol. Pushing your car with a CEL isn't a good idea either way.


The car may go into limp mode, but otherwise you shouldn't push it hard with a bad o2 sensor. Just get the code pulled and if in fact it's a bad sensor, then replace it and drive around for a few days until you're sure it wont come back.
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Old 12-26-2011, 01:26 AM
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Re: CEL constant, then flashing at low RPM, High load.

get the codes from the check engine light and go from there
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Old 12-28-2011, 08:23 PM
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Re: CEL constant, then flashing at low RPM, High load.

I got it checked out and the car is returning P0131 (primary o2 sensor) and p301-304 (cylinder misfires) codes. However, a mechanic suggested that the distributor wires and cap, could be causing the misfires too (as well as whole laundry list of other things). It's about $300 for the OEM sensor! I called NAPA, and they said they had one for $54. That seems like a more feasible option.
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Old 12-29-2011, 07:20 PM
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Re: CEL constant, then flashing at low RPM, High load.

Today the mechanic reset the computer, and later in the day, the ECU came on. I checked the codes, and this time it was giving me p1399 and p301.
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