Oxygen Sensors

[Comin' in Hot]

What change interval for O2 sensors?


Does anyone have the part numbers for the front and rear?

[Jeffonebuck]

Motorcraft #Dy1040 upstream , Dy1034 down, I read that they get lazy around 100k


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[martyo]

Are you getting a CEL after your recent work?

[Comin' in Hot]

No problems, There's 67,000 miles on my blue mm, I think it might be time to change them. I believe my rear O2 sensor's were shut off when my blue mm was dyno'd at your shop, so I was just going to replace the fronts.

My black mm has 127,000 on it and it's starting to throw below threshold codes. I'm planning on replacing all four.

I finally got the headers finished up today, laying on my back using jackstands sucked lol

[Comin' in Hot]

Motorcraft #Dy1040 upstream , Dy1034 down, I read that they get lazy around 100k


Thank you :2thumbs:

[martyo]

No problems, There's 67,000 miles on my blue mm, I think it might be time to change them. I believe my rear O2 sensor's were shut off when my blue mm was dyno'd at your shop, so I was just going to replace the fronts.

My black mm has 127,000 on it and it's starting to throw below threshold codes. I'm planning on replacing all four.

I finally got the headers finished up today, laying on my back using jackstands sucked lol

Which car did the headers go on?

[Comin' in Hot]

Which car did the headers go on?

The blue one

[martyo]

The blue one

Let me know if it throws 02 codes.

[larryo340]

My black mm has 127,000 on it and it's starting to throw below threshold codes. I'm planning on replacing all four

From what I've seen "Below threshold" is more than likely bad a bad cat.

[Limited360]

P0420? Most likely a failed catalyst... punch those babies out (or straight pipe em ) and fix the diagnostic so it always passes the bad cat..

[Curless]

We recommend them after 75,000 miles...they get lazy and don't perform...anything OBD2 we go with OEM sensors PERIOD.

[Limited360]

Just as an FYI, this vehicle was certified for 10 years, 120,000 mile useful life for all emissions related components. They shouldn't be lazy enough to affect anything below this mileage. Obviously use of vehicle will cause variation in this time period....

[Marauderjack]

I changed my upstream ones at 150K and the driver's side one was FUN to say the least!!:mad2:

Never had codes but someone here said they should be changed??:confused:

Rear ones are "off" in the tune!!

[whitey]

At 169k miles and still stock. Mileage has never changed and i calculate it religiously.....i even fill the fill tube to eliminate as many variables as possible. When to change them? When you get a code.

[RF Overlord]

^^^what whitey said^^^

Mary's car has over 185,000 and unless the PO changed them they're the originals. No codes. No change in MPG unless it's very recent.

FWIW, my DD has 130,000 miles and still averages 23 MPG, 80/20 city/highway. Considering how little had been done to the car when I got it, I doubt the O2s were changed.