Engine malfunction indicator light

[nitrofarm]

Ok after researching this light in the Forums.It appears that its directly linked to the o2 sensor. My sons new "used" motor that we gave a little seafoam to the fuel. Is getting this light back and forth. The Ford book refers me to the "Powertarin Control/Emissions Diagnosis Manual". I dont have this,so any input on this light would be welcome. I'm not to concerened about it.But I always welcome the oppurtunity to get edumacated. Thanks,Thomas

[georgeb]

You didn't say what year or even if it's a Festiva but for my '89 I grounded the single wire by the m/c w/ ign on and counted the blinks. Thankfully it fixed itself because it wasn't very clear what the prob was.

[Zanzer]

Are you still running on the Seafoam fuel mixture or is it doing it after all that has been ran out and a fresh fillup?

[nitrofarm]

You didn't say what year or even if it's a Festiva but for my '89 I grounded the single wire by the m/c w/ ign on and counted the blinks. Thankfully it fixed itself because it wasn't very clear what the prob was.

Sorry its a 94 Aspire

Are you still running on the Seafoam fuel mixture or is it doing it after all that has been ran out and a fresh fillup?

The Seafoam is still in the fuel-

[gauge_half_inch]

Are the aspires single wire or are the heated? 3/4wire

[link5186]

Single, even on the OBD2 ones.

[gauge_half_inch]

Hmm. If it were heated it could be that circuit is faulty, but with a single that's harder to check. I would recommend swapping with a known good one, or just buy a new one for $20 at autozone.

[Zanzer]

I'd finish off the tank of fuel and see if it goes away after a fresh fillup. After that start looking at the O2 sensor. If the sensor has high mileage it's a good possibility that it's at the end of it's lifespan (especially with it not being heated). Luckily they are cheap to replace, just be sure to replace it with a Denso unit.

[nitrofarm]

Thanks for the good feed back Fella's. Thomas