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Please check fitment notes & description for accurate information.
1998-1999 Mazda 626 2.0L
1997-2000 Mazda 626 2.5L
1995-2002 Mazda Millenia 2.3L
1995-1996 Mazda Millenia 2.5L
1997 Mazda MX-6 2.5L
Oxygen Sensor's Location:


How do I know the O2 sensor is good or not?
Check engine light on
A reduction in fuel economy.
Your catalytic converter fails unexpectedly
Exhaust emissions reach undesirable levels.
How to install the oxygen sensor?
Step 1 - Some sensors are equipped with a heat shield that must be removed before the sensor removal, this is performed by removing any mounting bolts.
Step 2 - By using a regular socket it minimizes potential damage to the sensor body and the threads, this technique helps avoid stripping the old sensor upon removal.
Step 3 - Then, locate and disconnect the wiring connector, this step should be done before removing the sensor if the wiring is still attached.
Step 4 - Its important that the wiring harness connectors are exactly the same, each sensor is unique to it's position and is located in the system by its connector configuration. (Note: some replacement sensors have a universal electrical connector that must be configured to the wiring of the old sensor.)
Step 5 - Use a small wire brush to help clean the threaded port to ensure a proper seal of the new sensor. Gently install the new oxygen sensor by hand while keeping the wiring and connector free from bends.
Step 6 - Gently tighten the sensor while keeping wiring free from damage, these sensors need to be fairly snug to avoid leakage.
Step 7 - Once the sensor is tightened, reinstall any heat shields or bracing that had to be removed.
Step 8 - After the heat shield has been reinstalled, mount the connector to it's holder and reattach the connector back onto the wiring harness. If the car has diagnostic trouble codes, they will need to be cleared.








Must Know Before Buying:
The following information is for instructional and guidance reference only. We try and make them as accurate as we can.
If Check Engine Light is on or an OBDII Trouble/Fault code occurs after installation, check the sensor with a voltmeter as below.
If the sensor is good, further diagnosis is required. There're many different codes for specific functional failures, which are NOT necessarily relevant to the sensor. Find out what the Code means before leaving any feedbacks.
Items that have been installed, altered or contaminated are non-returnable.
1. ONLY a defective sensor after tested by a voltmeter is applied to manufacturer warranty.
2. 20% restocking fee is required if buyer bought wrong items due to not paying attention to fitment information and ask for return.
The Price, Quality & Functionality of the O2 Sensor is fully covered under our warranty & return policy. However, refund for any labor cost, expense in a dealer shop or damage due to wrong installation is NOT covered.




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For 1994-2000 Mazda Miata Protege 1.8L L4 Upstream front O2 Oxygen Sensor
Please check fitment notes & description for accurate information.
1998-1999 Mazda 626 2.0L
Oxygen Sensor's Location:
How do I know the O2 sensor is good or not?
How to install the oxygen sensor? Step 1 - Some sensors are equipped with a heat shield that must be removed before the sensor removal, this is performed by removing any mounting bolts.
Step 2 - By using a regular socket it minimizes potential damage to the sensor body and the threads, this technique helps avoid stripping the old sensor upon removal.
Step 3 - Then, locate and disconnect the wiring connector, this step should be done before removing the sensor if the wiring is still attached.
Step 4 - Its important that the wiring harness connectors are exactly the same, each sensor is unique to it's position and is located in the system by its connector configuration. (Note: some replacement sensors have a universal electrical connector that must be configured to the wiring of the old sensor.)
Step 5 - Use a small wire brush to help clean the threaded port to ensure a proper seal of the new sensor. Gently install the new oxygen sensor by hand while keeping the wiring and connector free from bends.
Step 6 - Gently tighten the sensor while keeping wiring free from damage, these sensors need to be fairly snug to avoid leakage.
Step 7 - Once the sensor is tightened, reinstall any heat shields or bracing that had to be removed.
Step 8 - After the heat shield has been reinstalled, mount the connector to it's holder and reattach the connector back onto the wiring harness. If the car has diagnostic trouble codes, they will need to be cleared.
Must Know Before Buying:
The following information is for instructional and guidance reference only. We try and make them as accurate as we can.
If Check Engine Light is on or an OBDII Trouble/Fault code occurs after installation, check the sensor with a voltmeter as below.
Items that have been installed, altered or contaminated are non-returnable.
1. ONLY a defective sensor after tested by a voltmeter is applied to manufacturer warranty.
The Price, Quality & Functionality of the O2 Sensor is fully covered under our warranty & return policy. However, refund for any labor cost, expense in a dealer shop or damage due to wrong installation is NOT covered.
(1).Warehouse is located in Los Angeles, California, where local pickup transaction is temporarily not available.
(2).USPS PO Box, APO Army Post Office, FPO Fleet Post Office addresses are not available.
(3).We usually need a 1-2 business day as handling time for packaging and shipping scheduling. Estimated delivery dates should be 4-6 business days after your payment is received.
Items valued over $15 on eBay that include a warranty or service contract must contain additional details in seller's listing description.
5 Year Warranty Terms and Procedures
(1).The warranty terms only apply to all the auto parts purchased from AUTODAYPLUS.
(2).AUTODAYPLUS carries no warranty responsibilities for any auto parts removing fees, installation fees, consulting fees, labor costs, towing charges, rental car reimbursements.
(3).The stated 5 year warranty is limited to only one brand new replacement for each part purchased during 5 year warranty time period.
(4).AUTODAYPLUS promises free replacement due to quality defects or item not as described issues within 60 calendar days from the date when buyers receive their items in the situation when buyers are willing to provide convictive proofs or professional diagnose report if required, otherwise AUTODAYPLUS has the right to refuse any replacement requests.
(5).AUTODAYPLUS promises free replacement due to quality defects or item not as described issues after 90 calendar days from the date when buyers receive their items in the situation when buyers promise to prepay 15% of the original item sales price as postage for replacement, otherwise AUTODAYPLUS has the right to refuse any replacement requests.
(6).AUTODAYPLUS carries no warranty responsibilities for any replacement due to car accidents, drag racing, unprofessional replacement, road hazard, disassembly.
(7).Anyone who attempts to execute 5 year warranty procedures must be the original purchaser of the item(s), otherwise 5 year warranty terms void immediately.
(8).Anyone who attempts to execute 5 year warranty procedures must provide screenshot of his or her original eBay order details if required, including buyer user name, shipping address, item title, item id, final sales price.
(9).AUTODAYPLUS has the final power of interpretation of the above 5 Year Warranty Terms and Procedures.
Refunds will be credited within 2 or 3 business days after returned item(s) is received.
1. We maintain high standards of excellence (five stars review)and strive for 100% customer satisfaction! FEEDBACK IS VERY IMPORTANT TO US. We request that you contact us immediately BEFORE you give us neutral or negative feedback, so that we can satisfactorily address your concerns.
2. It is impossible to address issues if we do not know about them!
Payments are expected within 7 days after the last winning auction is closed; Otherwise Unpaid Item Dispute will be filed with eBay.
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