5 replies to this topic

[RazerX]

I have a 99, Fed edition, with the second O2 sensor in the trunk(it is grounded).  The OBD2 reader throws P1141 PowerTrain code, which when looked up indicates the 2nd O2 sensor has a problem.  That of course could be the sensor, the wiring or the ECU (or what ever the acronym Mazda now uses).

 

Bottomline is do i care?  I know the O2 sensors on NA are largely run open loop on track and doesn't matter.  However I want to ensure an NB is the same and that this code is not affecting my HP and TQ buy messing with timing or fuel mixture. 

 

Thoughts...

[Jim Drago]

It will not effect HP or TQ. But be sure to scan the ecu daily or you risk another problem that you ignore "because that light is always on"

Jim

[ChrisA]

It will not effect HP or TQ. But be sure to scan the ecu daily or you risk another problem that you ignore "because that light is always on"
Jim

I find with the light removed it doesn't bother me anymore.
RazerX, the 2nd O2 sensor does nothing but monitor the health of the Cat, which I certain you no longer have.

[RazerX]

So sounds like no reason to plunk down $100 just check daily per Jim's advice.  

[fotostars]

I took the bulb out of my '97 dash. OBD-II requires an O2 sensor downstream from the cat to monitor its performance.

It throws a light so you fail smog if the cat doesn't work as expected.

The ECU does absolutely nothing with the data from that sensor, so no big deal.

 

But Jim has a good point and it reminds me that I should check regularly for other codes that could indicate other issues (missifire, etc,...). Haven't looked in a looong time.

[Johnny D]

Anybody have/try the O2 Sensor Eliminator ??

 

http://www.magnumtun...azda/miata/1-8l

 

J~