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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / August 2006

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95 mazda protege reading check engine codes, help please.

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dogsled - 05 Aug 2006 23:55 GMT
I have a 95 Mazda Protege which does not have the OBDII connector, but
the older OBDI connector.  I'm told these were the transition year, so
I'm hoping that may be the source of my problem.  The check engine
light came on after I replaced the broken down pipe (piece between the
manifold and cat) where the o2 sensor is located.  I have a manual that
says for 94 and older that the codes can be flashed out on the check
engine light by placing a jumper between the TEN and GND pins on the
diagnosis connector and turning on the switch to count the flashes.  I
have done this, but no flashes are given by the check engine light.  I
cleared the codes as described in the manual, check engine light went
out temporarily but then came back on while driving.  I suspect that it
may be the o2 sensor,  160K miles and has not been changed, but I would
like to be able to read these codes out before I start shelling out
cash.  Does anyone know the method to get these codes to read out?
Al Bundy - 06 Aug 2006 14:29 GMT
> I have a 95 Mazda Protege which does not have the OBDII connector, but
> the older OBDI connector.  I'm told these were the transition year, so
[quoted text clipped - 10 lines]
> like to be able to read these codes out before I start shelling out
> cash.  Does anyone know the method to get these codes to read out?

The O2 sensor should have been changed as a maintenance item long ago.
You've been shelling out cash with less mileage than possible while the
sensor degraded.
Daryl Bryant - 06 Aug 2006 20:31 GMT
At 160K - Sounds like your O2 sensor is bad!

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Bing Bang Boom Viola Done!

> I have a 95 Mazda Protege which does not have the OBDII connector, but
> the older OBDI connector.  I'm told these were the transition year, so
[quoted text clipped - 10 lines]
> like to be able to read these codes out before I start shelling out
> cash.  Does anyone know the method to get these codes to read out?
dogsled - 06 Aug 2006 21:02 GMT
Maybe.  Mileage has not deteriated since it was new.
Still would like to be able to read the codes.

> At 160K - Sounds like your O2 sensor is bad!
>
[quoted text clipped - 14 lines]
> > like to be able to read these codes out before I start shelling out
> > cash.  Does anyone know the method to get these codes to read out?
Daryl Bryant - 07 Aug 2006 09:27 GMT
If not O2 sensor and no codes!! A solid check engine light could also
indicate a faulty computer connection or perhaps is a computer issue!
I'd recommend you hook up a scanner - Snap-On MT2500

> Maybe.  Mileage has not deteriated since it was new.
> Still would like to be able to read the codes.
[quoted text clipped - 17 lines]
> > > like to be able to read these codes out before I start shelling out
> > > cash.  Does anyone know the method to get these codes to read out?
dogsled - 09 Aug 2006 02:29 GMT
I have an O2 sensor on order, will give that a shot first.
Will have to take it to a shop to hook up the scanner if I can't read
the codes out with the jumper method.

> If not O2 sensor and no codes!! A solid check engine light could also
> indicate a faulty computer connection or perhaps is a computer issue!
[quoted text clipped - 24 lines]
> > > > like to be able to read these codes out before I start shelling out
> > > > cash.  Does anyone know the method to get these codes to read out?
 
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