How does the oxygen sensor interact with exhaust gases and what are the implications of its voltage signals on air/fuel ratio on 1998 Mazda Millenia?

Oxygen sensor generates a voltage from exhaust gases the ECU uses to infer air/fuel ratio: low means lean, high means rich. Installed in the exhaust manifold or turbocharger; some Mazdas have multiple sensors. Test voltage with the engine running; detach to test heater resistance. Remove shield, disconnect wiring, loosen sensor.

Genuine 1998 Mazda Millenia Oxygen Sensor

Oxygen O2 Sensor

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8 Oxygen Sensors found

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1998 Mazda Millenia Oxygen Sensor Part Number: KJ02-18-861C-9U
$168.33 MSRP: $224.48
You Save: $56.15 (26%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor, Oxygen
- Item Weight: 0.80 Pounds
- Condition: New
- Fitment Type: Direct Replacement
- SKU: KJ02-18-861C-9U
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following 1998 Mazda Millenia Submodels:
- Base, Millennium Edition, S | 6 Cyl 2.3 L GAS
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1998 Mazda Millenia Oxygen Sensor Part Number: KJ04-18-861B-9U
$185.00 MSRP: $246.72
You Save: $61.72 (26%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor, Oxygen
- Item Weight: 0.80 Pounds
- Condition: New
- Fitment Type: Direct Replacement
- SKU: KJ04-18-861B-9U
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following 1998 Mazda Millenia Submodels:
- Base, Millennium Edition, S | 6 Cyl 2.3 L GAS
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1998 Mazda Millenia Oxygen Sensor Part Number: KJ01-18-861A-9U
$191.45 MSRP: $255.31
You Save: $63.86 (26%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor, Oxygen
- Replaces: KJ01-18-861A
- Item Weight: 0.80 Pounds
- Condition: New
- Fitment Type: Direct Replacement
- SKU: KJ01-18-861A-9U
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
More Info
Fits the following 1998 Mazda Millenia Submodels:
- Base, Millennium Edition, S | 6 Cyl 2.3 L GAS
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1998 Mazda Millenia Oxygen Sensor Part Number: KJ03-18-861B-9U
$207.55 MSRP: $276.80
You Save: $69.25 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Oxygen
- Replaces: KJ03-18-861A-9U, KJ03-18-861A
- Item Weight: 0.80 Pounds
- Condition: New
- Fitment Type: Direct Replacement
- SKU: KJ03-18-861B-9U
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
More Info
Fits the following 1998 Mazda Millenia Submodels:
- Base, Millennium Edition, S | 6 Cyl 2.3 L GAS
View related parts
1998 Mazda Millenia Oxygen Sensor Part Number: KL62-18-861A-9U
$247.06 MSRP: $329.48
You Save: $82.42 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Oxygen
- Replaces: KL62-18-861A
- Item Weight: 0.80 Pounds
- Condition: New
- Fitment Type: Direct Replacement
- SKU: KL62-18-861A-9U
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
More Info
Fits the following 1998 Mazda Millenia Submodels:
- Base, L | 6 Cyl 2.5 L GAS
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1998 Mazda Millenia Oxygen Sensor Part Number: KLL5-18-861B-9U
$39.85 MSRP: $52.31
You Save: $12.46 (24%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Oxygen
- Item Weight: 0.80 Pounds
- Condition: New
- Fitment Type: Direct Replacement
- SKU: KLL5-18-861B-9U
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following 1998 Mazda Millenia Submodels:
- Base, L | 6 Cyl 2.5 L GAS
View related parts
1998 Mazda Millenia Oxygen Sensor Part Number: KL61-18-861A-9U
Product Specifications
- Other Name: Sensor, Oxygen
- Item Weight: 0.80 Pounds
- Condition: New
- Fitment Type: Direct Replacement
- SKU: KL61-18-861A-9U
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following 1998 Mazda Millenia Submodels:
- Base, L | 6 Cyl 2.5 L GAS
View related parts
1998 Mazda Millenia Oxygen Sensor Part Number: KLL6-18-861C
Product Specifications
- Other Name: Sensor, Oxygen
- Item Weight: 0.80 Pounds
- Condition: New
- Fitment Type: Direct Replacement
- SKU: KLL6-18-861C
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following 1998 Mazda Millenia Submodels:
- Base, L | 6 Cyl 2.5 L GAS

1998 Mazda Millenia Oxygen Sensor Parts and Q&A

Q: How does the oxygen sensor interact with exhaust gases and what are the implications of its voltage signals on air/fuel ratio on 1998 Mazda Millenia?
A: Oxygen sensor generates a voltage from exhaust gases the ECU uses to infer air/fuel ratio: low means lean, high means rich. Installed in the exhaust manifold or turbocharger; some Mazdas have multiple sensors. Test voltage with the engine running; detach to test heater resistance. Remove shield, disconnect wiring, loosen sensor.