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2.5L ('98-'01) Exhaust manifold for '98 2.5L?


1999Mazda Central Florida

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U.S. Military - Veteran
Joined
Jan 26, 2017
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32
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8
Vehicle Year
1999
Make / Model
Mazda
Engine Type
2.3 (4 Cylinder)
Transmission
Manual
Tire Size
Michelin LTX M/S P235-75R15
I'm getting set to replace my catalytic converter on the '99 2.5L. It sounds like it either has a hole or it's cracked, and I have slight loss of power. Looks straight-forward (2 bolts at the exhaust manifold) and a clamp with springs on other end.
The question is: would it be a good idea to just replace the O2 sensor (since I don't think it has ever been replaced.) Are o2 sensors from Rock Auto direct replacements?
Also, would messing with O2 sensor effect the computer? I'll probably just disconnect the battery before doing anything (like all manuals say to do.)
Also, these hangers look hard to get off...just cut them and replace them with new ones?
 

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Rock Auto 5% Discount Code: 7FA902352B4C01: April 5th, 2021

Fredness

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Location
Sasquatch Country!
Vehicle Year
2005
Make / Model
Ford Sport Trac
Engine Type
4.0 V6
Engine Size
4.0L SOHC
Transmission
Automatic
2WD / 4WD
4WD
Crack in the cat/flange leak causes air to get sucked in, between pulses, and causes the O2 sensor to get bad readings - it can cause lots of problems.
I would change the O2, if it has been more than 75K since you did it last.
Prefer Motorcraft - if you can find them.
 


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