I think the 1991 Honda Concerto engine duplicates the 1991 Civic engine, at
least at the 1.5 liter size.

For the c.1991 Concerto,
http://www.honda.co.uk/owner/Concert...k301/6-100.pdf is the
troubleshooting guide for error code 6, ECT sensor (a.k.a. on this page as "TW
sensor"). This guide says it might be bad; it might not be bad, too.

From the drawing at the above site, it looks like the ECT sensor (a.k.a. "TW
sensor") is item 24 at the Majestic site, under "Engine Sub Cord-Clamp,"
http://tinyurl.com/3dzjl , $24.16 + shipping from Majestic, at least for a 91
Civic LX 1.5 liter manual, etc.

Autozone also sells one for $24 and another for $39. You can search the Autozone
site for details.

Another drawing of the location appears at
http://www.honda.co.uk/owner/Concert...sk301/6-53.pdf , but it seems to
me to be a little misleading. Probably best to go with the first two links above
for locating the sensor.

I've never replaced one, but if I were going at this cold, I'd
- make sure the car's ignition switch was off,
- disconnect the battery ground cable
- try to disconnect the sensor electrically
- drain the coolant below the level of the sensor
- unfasten the sensor's mechanical connection

Caroline
1991 Civic LX manual 1.5 liter 153k miles

"Chris Garcia" <chris@evangar.com> wrote
> My wife's 91 civic is giving me error code #6 (ECT sensor)
>
> Does this mean that the sensor is bad or that the sensor is "sensing" (?)
> something bad...
>
> My guess is it's bad.
>
> Since I have no clue what category to look under at Majestic Honda to find
> the part, and hparts.com is under construction.. and I can't find my repair
> book for the car.. I was hoping someone could give me an idea of how much
> the part would run me, and how easy it'd be to replace..
>
> Thanks!