Honda Car Forum

#1 (**permalink**) 29 Mar 2009, 06:07 pm

My 1990 Civic 1.5 automatic turns on the check engine light
occasionally under brisk acceleration after warm-up. Without turning
car off, I look under pass side carpet for LED flashes. It flashes
once every couple of seconds. Turn car off, back on CEL is out, LED
still flashes only once. Car does not run any different with CEL on
or off. Any ideas? Clyde

#2 (**permalink**) 29 Mar 2009, 08:38 pm

messplay@sbcglobal.net wrote in news:6e7415e7-24ef-4902-bce0-ad52e53fce97
@r33g2000yqn.googlegroups.com:

> My 1990 Civic 1.5 automatic turns on the check engine light
> occasionally under brisk acceleration after warm-up. Without turning
> car off, I look under pass side carpet for LED flashes. It flashes
> once every couple of seconds. Turn car off, back on CEL is out, LED
> still flashes only once. Car does not run any different with CEL on
> or off. Any ideas? Clyde

Code 1. Oxygen sensor needs to be replaced.

--
Tegger

The Unofficial Honda/Acura FAQ
www.tegger.com/hondafaq/

#3 (**permalink**) 29 Mar 2009, 08:44 pm

Tegger wrote:
> messplay@sbcglobal.net wrote in news:6e7415e7-24ef-4902-bce0-ad52e53fce97
> @r33g2000yqn.googlegroups.com:
>
>> My 1990 Civic 1.5 automatic turns on the check engine light
>> occasionally under brisk acceleration after warm-up. Without turning
>> car off, I look under pass side carpet for LED flashes. It flashes
>> once every couple of seconds. Turn car off, back on CEL is out, LED
>> still flashes only once. Car does not run any different with CEL on
>> or off. Any ideas? Clyde
>
>
>
> Code 1. Oxygen sensor needs to be replaced.
>
>

on this gen vehicle, i've had code 1 triggered by coasting downhill on a
cold engine, and by low coolant level [leaking radiator] messing with
the engine temp readings. best check for those conditions first.

#4 (**permalink**) 29 Mar 2009, 09:07 pm

On Mar 29, 8:38*pm, Tegger <inva...@invalid.inv> wrote:
> messp...@sbcglobal.net wrote in news:6e7415e7-24ef-4902-bce0-ad52e53fce97
> @r33g2000yqn.googlegroups.com:
>
> > My 1990 Civic 1.5 automatic turns on the check engine light
> > occasionally under brisk acceleration after warm-up. *Without turning
> > car off, I look under pass side carpet for LED flashes. *It flashes
> > once every couple of seconds. *Turn car off, back on CEL is out, LED
> > still flashes only once. *Car does not run any different with CEL on
> > or off. *Any ideas? Clyde
>
> Code 1. Oxygen sensor needs to be replaced.
>
> --
> Tegger
>
> The Unofficial Honda/Acura FAQwww.tegger.com/hondafaq/

I am sorry, but I failed to mention in my text that the oxygen sensor
had been replaced about a 1,000 miles ago. Thanks for the answer. I'm
still not sure what else could be wrong. Clyde.

#5 (**permalink**) 29 Mar 2009, 09:21 pm

messplay@sbcglobal.net wrote:
> On Mar 29, 8:38�pm, Tegger <inva...@invalid.inv> wrote:
>> messp...@sbcglobal.net wrote in news:6e7415e7-24ef-4902-bce0-ad52e53fce97
>> @r33g2000yqn.googlegroups.com:
>>
>>> My 1990 Civic 1.5 automatic turns on the check engine light
>>> occasionally under brisk acceleration after warm-up. �Without turning
>>> car off, I look under pass side carpet for LED flashes. �It flashes
>>> once every couple of seconds. �Turn car off, back on CEL is out, LED
>>> still flashes only once. �Car does not run any different with CEL on
>>> or off. �Any ideas? Clyde
>> Code 1. Oxygen sensor needs to be replaced.
>>
>> --
>> Tegger
>>
>> The Unofficial Honda/Acura FAQwww.tegger.com/hondafaq/
>
> I am sorry, but I failed to mention in my text that the oxygen sensor
> had been replaced about a 1,000 miles ago. Thanks for the answer. I'm
> still not sure what else could be wrong. Clyde.

reset the ecu [see tegger.com for his faq's], then check as per my
previous post.

oem are the best sensors for this vehicle.

#6 (**permalink**) 30 Mar 2009, 11:46 am

On Mar 29, 7:07 pm, messp...@sbcglobal.net wrote:
> failed to mention in my text that the oxygen sensor
> had been replaced about a 1,000 miles ago.

Since it was replaced so recently, double check that the wiring from
the sensor to the connector is fine.

If this is not a Denso (= OEM manufacturer) sensor, then the
aftermarket one you have may very well be the problem, as JBeam notes.
A new Denso will run only about $30 through Amazon. Get the Denso part
number from www.densoproducts.com.

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