{
    "lazyNodes": false,
    "abFitnotesFlag": false,
    "abCrawlReviews": false,
    "productOptionsCookie": false,
    "orderDelayFlag": false,
    "skipSessionCookie": false,
    "covidMessage": false,
    "fullTitleCookie": false,
    "nrLoggerCookie": false,
    "checkoutReviewCookie": false,
    "productOptionSeqCookie": false,
    "maintenanceFlag": false,
    "bufferETACookie": false,
    "multiShippingDiscountFlag": false,
    "newFitmentFlag": false,
    "surveyOptInFlag": false,
    "crossSellFlag": false,
    "skuMappingFlag": false,
    "paySplitCookie": false,
    "callDisableFlag": false,
    "zipPaymentFlag": "u",
    "hassleFreeReturn": false,
    "lifetimeReplacement": false,
    "cpn_off": false
}
2019 Lincoln Nautilus
1
0
Price Match Guarantee
60-Day Returns
Lifetime Replacement
Price Match Guarantee
60-Day Returns
Lifetime Replacement
2019 Lincoln Nautilus

2019 Lincoln Nautilus Oxygen Sensors

Refine by:

Shop Catalog

Showing 1 - 15 of 27 results
Display item:
15
30
45
Sort by:
Before Catalytic Converter Oxygen Sensor, Sold individually, 5-wire, 6 Cyl 2.7L, OE Replacement Series - Before Catalytic Converter
Bosch®
Before Catalytic Converter Oxygen Sensor, Sold individually, 5-wire, 6 Cyl 2.7L, OE Replacement Series - Before Catalytic Converter
Part Number: BS17487
Guaranteed to Fit
$69.99
Vehicle Fitment
  • 2019 Lincoln Nautilus Select 6 Cyl 2.7L
  • 2019 Lincoln Nautilus Reserve 6 Cyl 2.7L
  • 2019 Lincoln Nautilus Black Label 6 Cyl 2.7L
  • 2019 Lincoln Nautilus Reserve 4 Cyl 2.0L
  • 2019 Lincoln Nautilus Select 4 Cyl 2.0L
  • 2019 Lincoln Nautilus Base 4 Cyl 2.0L
  • 2019 Lincoln Nautilus Black Label 4 Cyl 2.0L
Product Details
Location : Before Catalytic ConverterNotes : Heated Sensor TypeType : 5-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitMounting Style : Threaded-in Mounting StyleHex Size : 22 mm Hex SizeConnector Gender : Male ConnectorWarranty : 1-year Bosch limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Promotions : CarParts EuroSeries : OE Replacement Series
After Catalytic Converter Oxygen Sensor, FI, Turbocharged, GAS, B1S2, Sold individually, 4-wire, 4 Cyl 2.0L, Walker Products Aftermarket Base Sensor
Walker Products®
After Catalytic Converter Oxygen Sensor, FI, Turbocharged, GAS, B1S2, Sold individually, 4-wire, 4 Cyl 2.0L, Walker Products Aftermarket Base Sensor
Part Number: WKP350-341024
Guaranteed to Fit
$72.49
Vehicle Fitment
  • 2019 Lincoln Nautilus Reserve 4 Cyl 2.0L FI, Turbocharged, GAS, B1S2
  • 2019 Lincoln Nautilus Select 4 Cyl 2.0L FI, Turbocharged, GAS, B1S2
  • 2019 Lincoln Nautilus Base 4 Cyl 2.0L FI, Turbocharged, GAS, B1S2
  • 2019 Lincoln Nautilus Black Label 4 Cyl 2.0L FI, Turbocharged, GAS, B1S2
Product Details
Location : After Catalytic ConverterNotes : 29.52 in. Overall Length; Heated Sensor Type; 20 Wire Gauge MeasurementType : 4-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitWire Length : 27.16 in. Wire LengthThread Size : 18 mm Thread SizeMounting Style : Threaded-in Mounting StyleConnector Gender : Female ConnectorWarranty : 90-day Walker Products limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Series : Walker Products Aftermarket Base Sensor
After Catalytic Converter Oxygen Sensor, engineversion: EcoBoost, Sold individually, 4 Cyl 2.0L
Motorcraft®
After Catalytic Converter Oxygen Sensor, engineversion: EcoBoost, Sold individually, 4 Cyl 2.0L
Part Number: MIDY1583
Guaranteed to Fit
$109.49
Vehicle Fitment
  • 2019 Lincoln Nautilus Select 4 Cyl 2.0L engineversion: EcoBoost
  • 2019 Lincoln Nautilus Base 4 Cyl 2.0L engineversion: EcoBoost
  • 2019 Lincoln Nautilus Black Label 4 Cyl 2.0L engineversion: EcoBoost
  • 2019 Lincoln Nautilus Reserve 4 Cyl 2.0L engineversion: EcoBoost
Product Details
Location : After Catalytic ConverterQuantity Sold : Sold individuallyWarranty : 2-year or unlimited-mile Motorcraft limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

After Catalytic Converter Oxygen Sensor, FI, Turbocharged, GAS, B1S2, Sold individually, 4 Cyl 2.0L, Walker Products Original Equipment Base Sensor
Walker Products®
After Catalytic Converter Oxygen Sensor, FI, Turbocharged, GAS, B1S2, Sold individually, 4 Cyl 2.0L, Walker Products Original Equipment Base Sensor
Part Number: WKP250-241184
Guaranteed to Fit
$103.49
Vehicle Fitment
  • 2019 Lincoln Nautilus Reserve 4 Cyl 2.0L FI, Turbocharged, GAS, B1S2
  • 2019 Lincoln Nautilus Select 4 Cyl 2.0L FI, Turbocharged, GAS, B1S2
  • 2019 Lincoln Nautilus Base 4 Cyl 2.0L FI, Turbocharged, GAS, B1S2
  • 2019 Lincoln Nautilus Black Label 4 Cyl 2.0L FI, Turbocharged, GAS, B1S2
Product Details
Location : After Catalytic ConverterQuantity Sold : Sold individuallyProduct Fit : Direct FitWarranty : 90-day Walker Products limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Series : Walker Products Original Equipment Base Sensor
Oxygen Sensor, Sold individually, 4-wire
Denso®
Oxygen Sensor, Sold individually, 4-wire
Part Number: NP2348039
Guaranteed to Fit
$59.99
Vehicle Fitment
  • 2019 Lincoln Nautilus Reserve 4 Cyl 2.0L O.E. Quality Replacement Sensor
  • 2019 Lincoln Nautilus Select 4 Cyl 2.0L O.E. Quality Replacement Sensor
  • 2019 Lincoln Nautilus Base 4 Cyl 2.0L O.E. Quality Replacement Sensor
  • 2019 Lincoln Nautilus Black Label 4 Cyl 2.0L O.E. Quality Replacement Sensor
Product Details
Location : After Catalytic ConverterNotes : HeatedType : 4-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitWire Length : 24.76 in. Wire LengthThread Size : 18 mm Thread SizeConnector Gender : Female ConnectorWarranty : 1-year Denso limited WarrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

After Catalytic Converter Oxygen Sensor, Eng Vin: P, FI, Turbocharged, GAS, B1S2, B2S2, Sold individually, 4-wire, 6 Cyl 2.7L - After Catalytic Converter
Walker Products®
After Catalytic Converter Oxygen Sensor, Eng Vin: P, FI, Turbocharged, GAS, B1S2, B2S2, Sold individually, 4-wire, 6 Cyl 2.7L - After Catalytic Converter
Part Number: WKP350341081
Guaranteed to Fit
$54.49
Vehicle Fitment
  • 2019 Lincoln Nautilus Select 6 Cyl 2.7L Eng Vin: P, FI, Turbocharged, GAS, B1S2, B2S2
  • 2019 Lincoln Nautilus Reserve 6 Cyl 2.7L Eng Vin: P, FI, Turbocharged, GAS, B1S2, B2S2
  • 2019 Lincoln Nautilus Black Label 6 Cyl 2.7L Eng Vin: P, FI, Turbocharged, GAS, B1S2, B2S2
Product Details
Location : After Catalytic ConverterNotes : (4) Wire Quantity; 400 mm Overall Length; HeatedType : 4-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitThread Size : M18 Thread SizeMounting Style : Threaded-in Mounting StyleConnector Gender : Female ConnectorConnector Shape : Rectangular Connector ShapeWarranty : 90-day Walker Products limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Nickel and Nickel Alloyed Stainless Steel, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

After Catalytic Converter Oxygen Sensor, Eng Vin: P, FI, Turbocharged, GAS, B1S2, B2S2, Sold individually, 4-wire, 6 Cyl 2.7L - After Catalytic Converter
Walker Products®
After Catalytic Converter Oxygen Sensor, Eng Vin: P, FI, Turbocharged, GAS, B1S2, B2S2, Sold individually, 4-wire, 6 Cyl 2.7L - After Catalytic Converter
Part Number: WKP250241247
Guaranteed to Fit
$62.99
Vehicle Fitment
  • 2019 Lincoln Nautilus Select 6 Cyl 2.7L Eng Vin: P, FI, Turbocharged, GAS, B1S2, B2S2
  • 2019 Lincoln Nautilus Reserve 6 Cyl 2.7L Eng Vin: P, FI, Turbocharged, GAS, B1S2, B2S2
  • 2019 Lincoln Nautilus Black Label 6 Cyl 2.7L Eng Vin: P, FI, Turbocharged, GAS, B1S2, B2S2
Product Details
Location : After Catalytic ConverterNotes : (4) Wire Quantity; 400 mm Overall Length; HeatedType : 4-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitThread Size : M18 Thread SizeMounting Style : Threaded-in Mounting StyleConnector Gender : Female ConnectorConnector Shape : Rectangular Connector ShapeWarranty : 90-day Walker Products limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Nickel and Nickel Alloyed Stainless Steel, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Before Catalytic Converter Oxygen Sensor, FI, Turbocharged, GAS, B1S1; B2S1, Sold individually, 5-wire, 6 Cyl 2.7L, Walker Products Aftermarket Base Sensor - Before Catalytic Converter
Walker Products®
Before Catalytic Converter Oxygen Sensor, FI, Turbocharged, GAS, B1S1; B2S1, Sold individually, 5-wire, 6 Cyl 2.7L, Walker Products Aftermarket Base Sensor - Before Catalytic Converter
Part Number: WKP35035060
Guaranteed to Fit
$90.49
Vehicle Fitment
  • 2019 Lincoln Nautilus Select 6 Cyl 2.7L FI, Turbocharged, GAS, B1S1; B2S1
  • 2019 Lincoln Nautilus Black Label 6 Cyl 2.7L FI, Turbocharged, GAS, B1S1; B2S1
  • 2019 Lincoln Nautilus Reserve 4 Cyl 2.0L FI, Turbocharged, GAS, B1S1
  • 2019 Lincoln Nautilus Select 4 Cyl 2.0L FI, Turbocharged, GAS, B1S1
  • 2019 Lincoln Nautilus Reserve 6 Cyl 2.7L FI, Turbocharged, GAS, B1S1; B2S1
  • 2019 Lincoln Nautilus Base 4 Cyl 2.0L FI, Turbocharged, GAS, B1S1
  • 2019 Lincoln Nautilus Black Label 4 Cyl 2.0L FI, Turbocharged, GAS, B1S1
Product Details
Location : Before Catalytic ConverterNotes : Wideband sensorType : 5-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitWire Length : 19.69 in. Wire LengthWarranty : 90-day Walker Products limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Series : Walker Products Aftermarket Base Sensor
Before Catalytic Converter Oxygen Sensor, engineversion: EcoBoost, Sensor - Hego, Sold individually, 4-wire, 4 Cyl 2.0L, Motorcraft OE Replacement - Before Catalytic Converter
Motorcraft®
Before Catalytic Converter Oxygen Sensor, engineversion: EcoBoost, Sensor - Hego, Sold individually, 4-wire, 4 Cyl 2.0L, Motorcraft OE Replacement - Before Catalytic Converter
Part Number: MIDY1330
Guaranteed to Fit
$101.49
Vehicle Fitment
  • 2019 Lincoln Nautilus Reserve 4 Cyl 2.0L engineversion: EcoBoost, Sensor - Hego
  • 2019 Lincoln Nautilus Select 4 Cyl 2.0L engineversion: EcoBoost, Sensor - Hego
  • 2019 Lincoln Nautilus Base 4 Cyl 2.0L engineversion: EcoBoost, Sensor - Hego
  • 2019 Lincoln Nautilus Black Label 4 Cyl 2.0L engineversion: EcoBoost, Sensor - Hego
Product Details
Location : Before Catalytic ConverterType : 4-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitReplaces OE Number : E1GZ9F472CWarranty : 2-year or unlimited-mile Motorcraft limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Series : Motorcraft OE Replacement
After Catalytic Converter Oxygen Sensor, O.E. Quality Replacement Sensor, Sold individually, 6 Cyl 2.7L, OE Replacement Series - After Catalytic Converter
Denso®
After Catalytic Converter Oxygen Sensor, O.E. Quality Replacement Sensor, Sold individually, 6 Cyl 2.7L, OE Replacement Series - After Catalytic Converter
Part Number: NP2348050
Guaranteed to Fit
$36.49
Vehicle Fitment
  • 2019 Lincoln Nautilus Reserve 6 Cyl 2.7L O.E. Quality Replacement Sensor
  • 2019 Lincoln Nautilus Select 6 Cyl 2.7L O.E. Quality Replacement Sensor
  • 2019 Lincoln Nautilus Black Label 6 Cyl 2.7L O.E. Quality Replacement Sensor
Product Details
Location : After Catalytic ConverterQuantity Sold : Sold individuallyProduct Fit : Direct FitWarranty : 1-year Denso limited WarrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Series : OE Replacement Series
Oxygen Sensor, Sold individually, 4-wire, Motorcraft OE Replacement
Motorcraft®
Oxygen Sensor, Sold individually, 4-wire, Motorcraft OE Replacement
Part Number: MIDY1306
Guaranteed to Fit
$115.49
Vehicle Fitment
  • 2019 Lincoln Nautilus Select 6 Cyl 2.7L engineversion: EcoBoost, Sensor - Hego
  • 2019 Lincoln Nautilus Reserve 6 Cyl 2.7L engineversion: EcoBoost, Sensor - Hego
  • 2019 Lincoln Nautilus Black Label 6 Cyl 2.7L engineversion: EcoBoost, Sensor - Hego
Product Details
Location : Before Catalytic ConverterType : 4-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitReplaces OE Number : FR3Z9F472AWarranty : 2-year or unlimited-mile Motorcraft limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Series : Motorcraft OE Replacement
Before Catalytic Converter Oxygen Sensor, O.E. Quality Replacement Sensor, Sold individually, 5-wire, 4 Cyl 2.0L - Before Catalytic Converter
Denso®
Before Catalytic Converter Oxygen Sensor, O.E. Quality Replacement Sensor, Sold individually, 5-wire, 4 Cyl 2.0L - Before Catalytic Converter
Part Number: NP2345173
Guaranteed to Fit
$60.49
Vehicle Fitment
  • 2019 Lincoln Nautilus Select 6 Cyl 2.7L O.E. Quality Replacement Sensor
  • 2019 Lincoln Nautilus Reserve 6 Cyl 2.7L O.E. Quality Replacement Sensor
  • 2019 Lincoln Nautilus Black Label 6 Cyl 2.7L O.E. Quality Replacement Sensor
  • 2019 Lincoln Nautilus Reserve 4 Cyl 2.0L O.E. Quality Replacement Sensor
  • 2019 Lincoln Nautilus Select 4 Cyl 2.0L O.E. Quality Replacement Sensor
  • 2019 Lincoln Nautilus Base 4 Cyl 2.0L O.E. Quality Replacement Sensor
  • 2019 Lincoln Nautilus Black Label 4 Cyl 2.0L O.E. Quality Replacement Sensor
Product Details
Location : Before Catalytic ConverterNotes : Heated Sensor TypeType : 5-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitWire Length : 14.65 in. Wire LengthThread Size : 0.71 in. Thread SizeWarranty : 1-year Denso limited WarrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Passenger Side, After Catalytic Converter Oxygen Sensor, engineversion: EcoBoost, Sold individually, 6 Cyl 2.7L
Motorcraft®
Passenger Side, After Catalytic Converter Oxygen Sensor, engineversion: EcoBoost, Sold individually, 6 Cyl 2.7L
Part Number: MIDY1503
Guaranteed to Fit
$46.99
Vehicle Fitment
  • 2019 Lincoln Nautilus Reserve 6 Cyl 2.7L engineversion: EcoBoost
  • 2019 Lincoln Nautilus Select 6 Cyl 2.7L engineversion: EcoBoost
  • 2019 Lincoln Nautilus Black Label 6 Cyl 2.7L engineversion: EcoBoost
Product Details
Location : Passenger Side, After Catalytic ConverterQuantity Sold : Sold individuallyWarranty : 2-year or unlimited-mile Motorcraft limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Before Catalytic Converter Oxygen Sensor, FI, Turbocharged, GAS, B1S1, Sold individually, 5-wire, 4 Cyl 2.0L, Walker Products Original Equipment Base Sensor - Before Catalytic Converter
Walker Products®
Before Catalytic Converter Oxygen Sensor, FI, Turbocharged, GAS, B1S1, Sold individually, 5-wire, 4 Cyl 2.0L, Walker Products Original Equipment Base Sensor - Before Catalytic Converter
Part Number: WKP25025025
Guaranteed to Fit
$103.99
Vehicle Fitment
  • 2019 Lincoln Nautilus Select 6 Cyl 2.7L FI, Turbocharged, GAS, B1S1; B2S1
  • 2019 Lincoln Nautilus Black Label 6 Cyl 2.7L FI, Turbocharged, GAS, B1S1; B2S1
  • 2019 Lincoln Nautilus Reserve 4 Cyl 2.0L FI, Turbocharged, GAS, B1S1
  • 2019 Lincoln Nautilus Select 4 Cyl 2.0L FI, Turbocharged, GAS, B1S1
  • 2019 Lincoln Nautilus Reserve 6 Cyl 2.7L FI, Turbocharged, GAS, B1S1; B2S1
  • 2019 Lincoln Nautilus Base 4 Cyl 2.0L FI, Turbocharged, GAS, B1S1
  • 2019 Lincoln Nautilus Black Label 4 Cyl 2.0L FI, Turbocharged, GAS, B1S1
Product Details
Location : Before Catalytic ConverterNotes : Wideband sensorType : 5-wireQuantity Sold : Sold individuallyProduct Fit : Direct FitWire Length : 19.69 in. Wire LengthInterchange Part Number : 2345019Warranty : 90-day Walker Products limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Series : Walker Products Original Equipment Base Sensor
Atomic, O2 Sensor Wideband
MSD®
Atomic, O2 Sensor Wideband
Part Number: M46A2930
Universal Fit
$145.95
Product Details
Quantity Sold : Sold individuallyProduct Fit : UniversalWarranty : 1-year MSD limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Page 1 of 2 | Showing 1 - 15 of 27 results

Popular Products

Helpful Automotive Resources

P2187 Code: System too Lean at Idle (Bank 1)
P2187 Code: System too Lean at Idle (Bank 1)Note that there is only one bank if your car has a straight engine and the scan tool will always refer to that bank as “Bank 1.” P2187 code indicates that your vehicle’s computer detected a potential issue with the fuel mixture at idle.
P2270 Code: O2 Sensor Signal Biased / Stuck Lean (Bank 1, Sensor 2)
P2270 Code: O2 Sensor Signal Biased / Stuck Lean (Bank 1, Sensor 2)Bank 1 is where the #1 spark plug is. O2 sensor 1/1 is the upstream sensor on Bank 1 (different for a Ford than for a Chevy or a Dodge), and O2 sensor 1/2 is the downstream sensor on Bank 1. O2 2/1 is upstream on Bank 2 and O2
P0141 Code: Oxygen Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)
P0141 Code: Oxygen Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)With that in mind, it’s important to note that Bank 1 is always where the number 1 cylinder is located. Thus, on Ford pickups, Bank 1 is the passenger side bank, but on Chevy and Dodge pickups, Bank 1 is the driver side bank. You need to know this, or
P0042 Code: HO2S Heater Control Circuit Bank 1 Sensor 3
P0042 Code: HO2S Heater Control Circuit Bank 1 Sensor 3Bank 1 is the side of the engine where the #1 cylinder is located. P0042 code is set when your car’s PCM determines a potential problem with the heater element circuit of the oxygen sensor.
P0135 Code: Heated O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)
P0135 Code: Heated O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)Diagnostic trouble code (DTC) P0135 stands for “Oxygen O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1).” It is set when the car’s primary computer—also called the powertrain control module or PCM—determines that the heated oxygen sensor (HO2S) 1 heater current is higher or lower than the ideal amp for
P0134: O2 Sensor Circuit No Activity Detected (Bank 1, Sensor 1)
P0134: O2 Sensor Circuit No Activity Detected (Bank 1, Sensor 1)The Bank 1 portion of the code refers to the side of the engine with the number one cylinder. Sensor 1 refers to the upstream O2 sensor.