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2018 Ford Flex

Catalytic Converters

Don’t take an emissions test until you’ve replaced a bad catalytic converter. Residue from exhaust gases can build up in the catalytic converter over time, resulting in increased emissions that will definitely register during the test. If your catalytic converter is clogged or otherwise in bad shape, replace it immediately. Good thing CarParts.com has a wide range of catalytic converters made by top manufacturers in the industry. Take a look at our products today and choose one that matches your application.
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Radiator Side Direct Replacement Series Catalytic Converter, 3.5L Engine, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Part Number: RF96030008
Guaranteed to Fit
$235.99
Vehicle Fitment
  • 2018 Ford Flex Limited 6 Cyl 3.5L
  • 2018 Ford Flex SE 6 Cyl 3.5L
  • 2018 Ford Flex SEL 6 Cyl 3.5L
Product Details
Location : Front, Radiator SideEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Notes : Manifold Converter; Includes (4) Hexbolts, (4) Washers, (2) Nuts, and (2) GasketsRestricted States : California|Colorado|New York|MaineType : Manifold ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyGasket Included : With GasketOxygen Sensor Ports : 2 Sensor PortsOxygen Sensor Port Location : Factory OE LocationsWarranty : 5-year or 50,000-mile Evan Fischer limited warrantyReturns Policy : 30-Day Return PolicyProp 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.

Interchange Part Number : 30584, 19516, 674255, 1378Series : Direct Replacement SeriesTube Material : Stainless Steel
Firewall Side Direct Replacement Series Catalytic Converter, 3.5L Engine, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Part Number: RF96030007
Guaranteed to Fit
$247.99
Vehicle Fitment
  • 2018 Ford Flex Limited 6 Cyl 3.5L
  • 2018 Ford Flex SE 6 Cyl 3.5L
  • 2018 Ford Flex SEL 6 Cyl 3.5L
Product Details
Location : Front, Firewall SideEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Notes : Manifold Converter; Includes (4) Hexbolts, (6) Washers, and (1) Manifold Gasket; 13.25 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Manifold ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyGasket Included : With GasketOxygen Sensor Ports : 2 Sensor PortsOxygen Sensor Port Location : Factory OE LocationsWarranty : 5-year or 50,000-mile Evan Fischer limited warrantyReturns Policy : 30-Day Return PolicyProp 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.

Interchange Part Number : 30585, 19517, 674256, 1379Series : Direct Replacement SeriesTube Material : Stainless Steel
Firewall and Radiator Side Direct Replacement Series Catalytic Converters, 3.5L Engine, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Part Number: SET-RF96030007
Guaranteed to Fit
$459.99
Vehicle Fitment
  • 2018 Ford Flex Limited 6 Cyl 3.5L
  • 2018 Ford Flex SE 6 Cyl 3.5L
  • 2018 Ford Flex SEL 6 Cyl 3.5L
Product Details
Location : Front, Firewall and Radiator SideEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Notes : Manifold Converter; Includes (4) Hexbolts, (6) Washers, and (1) Manifold GasketComponents : (1) Front Driver Side, Manifold Catalytic Converter, (1) Front Passenger Side, Manifold Catalytic ConverterRestricted States : California|Colorado|New York|MaineType : Manifold ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Set of 2Gasket Included : With GasketOxygen Sensor Ports : 2 Sensor PortsOxygen Sensor Port Location : Factory OE LocationsWarranty : 5-year or 50,000-mile Evan Fischer limited warrantyReturns Policy : 30-Day Return PolicyProp 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.

Interchange Part Number : 30585, 19517, 674256, 1379, 30584, 19516, 674255, 1378Series : Direct Replacement SeriesTube Material : Stainless Steel
Driver Side Exact Fit Series Direct Fit Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Part Number: DAV19516
Guaranteed to Fit
$247.99
Vehicle Fitment
  • 2018 Ford Flex SEL 6 Cyl 3.5L Naturally Aspirated, AWD
  • 2018 Ford Flex Limited 6 Cyl 3.5L Naturally Aspirated, FWD
  • 2018 Ford Flex SE 6 Cyl 3.5L Naturally Aspirated, FWD
Product Details
Location : Driver SideEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Notes : 14 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Manifold ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyGasket Included : With GasketOxygen Sensor Ports : Factory OEM PortsOxygen Sensor Port Location : Factory OEM LocationsWarranty : 25,000-mile Davico limited warranty on catalyst emission properties and 5-year or 50,000-mile limited warranty on tube, shell and weldsProp 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.

Interchange Part Number : RF96030008, 674255, 1378Series : Exact Fit SeriesTube Material : Aluminized Steel
Passenger Side Exact Fit Series Direct Fit Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Part Number: DAV19517
Guaranteed to Fit
$247.99
Vehicle Fitment
  • 2018 Ford Flex SEL 6 Cyl 3.5L Naturally Aspirated, AWD
  • 2018 Ford Flex Limited 6 Cyl 3.5L Naturally Aspirated, FWD
  • 2018 Ford Flex SE 6 Cyl 3.5L Naturally Aspirated, FWD
Product Details
Location : Passenger SideEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Notes : 15 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Manifold ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyGasket Included : With GasketOxygen Sensor Ports : Factory OEM PortsOxygen Sensor Port Location : Factory OEM LocationsWarranty : 25,000-mile Davico limited warranty on catalyst emission properties and 5-year or 50,000-mile limited warranty on tube, shell and weldsProp 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.

Interchange Part Number : RF96030007, 674256, 1379Series : Exact Fit SeriesTube Material : Aluminized Steel
OEM Grade Series Direct Fit Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Part Number: M6652942
Guaranteed to Fit
$675.00
Vehicle Fitment
  • 2018 Ford Flex SEL 6 Cyl 3.5L Naturally Aspirated
  • 2018 Ford Flex Limited 6 Cyl 3.5L Naturally Aspirated
  • 2018 Ford Flex SE 6 Cyl 3.5L Naturally Aspirated
Product Details
Location : Front, ForwardEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Notes : (1) Converter Quantity; Bolt-On Inlet Attachment; Stainless Steel Material; Ceramic Substrate MaterialRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyGasket Included : With GasketOxygen Sensor Ports : Factory OEM PortsOxygen Sensor Port Location : Factory OEM LocationsWarranty : 5-year or 50,000-mile Magnaflow limited warranty on Construction; 25,000-mile Magnaflow limited warranty on EmissionsProp 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 : OEM Grade SeriesTube Material : Stainless Steel
OEM Grade Series Direct Fit Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Part Number: M6621017
Guaranteed to Fit
$785.00
Vehicle Fitment
  • 2018 Ford Flex SEL 6 Cyl 3.5L Naturally Aspirated
  • 2018 Ford Flex Limited 6 Cyl 3.5L Naturally Aspirated
  • 2018 Ford Flex SE 6 Cyl 3.5L Naturally Aspirated
Product Details
Location : RearEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Notes : (1) Converter Quantity; Bolt-On Inlet Attachment; Stainless Steel Body Material; Ceramic Substrate Material; 19.5 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyGasket Included : With GasketOxygen Sensor Ports : Factory OEM PortsOxygen Sensor Port Location : Factory OEM LocationsWarranty : 5-year or 50,000-mile Magnaflow limited warranty on Construction; 25,000-mile Magnaflow limited warranty on EmissionsProp 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 : OEM Grade SeriesTube Material : Stainless Steel
Front, Driver Side ECO III Series Direct Fit Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Part Number: EAST30584
Guaranteed to Fit
$336.49
Vehicle Fitment
  • 2018 Ford Flex SEL 6 Cyl 3.5L Radiator Side
  • 2018 Ford Flex Limited 6 Cyl 3.5L Radiator Side
  • 2018 Ford Flex SE 6 Cyl 3.5L Radiator Side
Product Details
Location : Front, Driver SideEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Notes : 15 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Manifold ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyGasket Included : With GasketOxygen Sensor Ports : Factory OEM PortsOxygen Sensor Port Location : Factory OEM LocationsWarranty : 5-year or 50,000-mile Eastern 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.

Interchange Part Number : RF96030008, 674255, 1378Series : ECO III SeriesTube Material : Aluminized Steel
Front, Passenger Side ECO III Series Direct Fit Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Part Number: EAST30585
Guaranteed to Fit
$451.99
Vehicle Fitment
  • 2018 Ford Flex SEL 6 Cyl 3.5L Firewall Side
  • 2018 Ford Flex Limited 6 Cyl 3.5L Firewall Side
  • 2018 Ford Flex SE 6 Cyl 3.5L Firewall Side
Product Details
Location : Front, Passenger SideEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Notes : 13.25 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Manifold ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyGasket Included : With GasketOxygen Sensor Ports : Factory OEM PortsOxygen Sensor Port Location : Factory OEM LocationsWarranty : 5-year or 50,000-mile Eastern 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.

Interchange Part Number : RF96030007, 674256, 1379Series : ECO III SeriesTube Material : Aluminized Steel
Direct Fit Catalytic Converter, CARB and Federal EPA Standards, 50-state Legal
Part Number: CAT771453
Guaranteed to Fit
$889.99
Vehicle Fitment
  • 2018 Ford Flex SEL 6 Cyl 3.5L Naturally Aspirated; JFMXJ03.5VEP; EO Number : D-798-9
  • 2018 Ford Flex Limited 6 Cyl 3.5L Naturally Aspirated; JFMXJ03.5VEP; EO Number : D-798-9
  • 2018 Ford Flex SE 6 Cyl 3.5L Naturally Aspirated; JFMXJ03.5VEP; EO Number : D-798-9
Product Details
Location : Front, Driver SideEmissions : CARB and Federal EPA Standards, 50-state LegalType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyEO Number : D-798-9Gasket Included : Without GasketOxygen Sensor Ports : Factory OEM PortsOxygen Sensor Port Location : Factory OEM LocationsWarranty : 5-year or 50,000-mile Catco limited warranty on converter body with 25,000-mile limited warranty on emissionsProp 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.

Tube Material : Stainless Steel
Rear Ultra Series Direct Fit Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Part Number: WK16721
Guaranteed to Fit
$533.99
Vehicle Fitment
  • 2018 Ford Flex SEL 6 Cyl 3.5L
  • 2018 Ford Flex Limited 6 Cyl 3.5L
  • 2018 Ford Flex SE 6 Cyl 3.5L
Product Details
Location : RearEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Notes : 5.75 in. Body Length; 4 in. Body Width; 4 in. Body Height; 1 Inlet Quantity; 8 Bolt Welded Flange Inlet Type; 1 Outlet Quantity; 2 Bolt Welded Flange Outlet Type; Stainless Steel Material; Ceramic Substrate Material; Round Body Shape; Includes Mounting Hardware; 17.5 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Manifold ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyGasket Included : Without GasketOxygen Sensor Ports : Factory OEM PortsOxygen Sensor Port Location : Factory OEM LocationsWarranty : 25,000-mile Walker limited warranty on catalytic performance and 5-year or 50,000-mile structural integrity 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 : Ultra Series
Front, Driver Side Direct Fit Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Part Number: CAT5405
Guaranteed to Fit
$496.99
Vehicle Fitment
  • 2018 Ford Flex Limited 6 Cyl 3.5L Federal and California Emissions
Product Details
Location : Front, Driver SideEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Restricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyGasket Included : With GasketOxygen Sensor Ports : Factory OEM PortsOxygen Sensor Port Location : Factory OEM LocationsWarranty : 5-year or 50,000-mile Catco limited warranty on converter body with 50,000-mile limited warranty on emissionsProp 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.

Tube Material : Stainless Steel
Front Ultra Series Direct Fit Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Part Number: WK16728
Guaranteed to Fit
$465.99
Vehicle Fitment
  • 2018 Ford Flex SEL 6 Cyl 3.5L
  • 2018 Ford Flex Limited 6 Cyl 3.5L
  • 2018 Ford Flex SE 6 Cyl 3.5L
Product Details
Location : FrontEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Notes : 17.75 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Manifold ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyGasket Included : Without GasketOxygen Sensor Ports : Factory OEM PortsOxygen Sensor Port Location : Factory OEM LocationsWarranty : 25,000-mile Walker limited warranty on catalytic performance and 5-year or 50,000-mile structural integrity 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 : Ultra SeriesTube Material : Stainless Steel
No Returns Accepted - Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be used in vehicles originally purchased in CA, CO, NY or ME), Semi-Universal (Welding Required)
Part Number: EAST92204
Guaranteed to Fit
$187.49
Vehicle Fitment
  • 2018 Ford Flex Limited 6 Cyl 3.5L
Product Details
Location : Front, Driver SideEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Notes : 7.75 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Semi-Universal (Welding Required)Recommended Use : OE ReplacementQuantity Sold : Sold individuallyGasket Included : Without GasketWarranty : 5-year or 50,000-mile Eastern limited warrantyReturns Policy : NON-RETURNABLEProp 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 : ECO III SeriesTube Material : Aluminized Steel
Front, Driver Side, Radiator Side Direct Fit Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Part Number: APE641478
Guaranteed to Fit
$322.99
Vehicle Fitment
  • 2018 Ford Flex SEL 6 Cyl 3.5L Naturally Aspirated, Direct Fit; Manifold Unit
  • 2018 Ford Flex Limited 6 Cyl 3.5L Naturally Aspirated, Direct Fit; Manifold Unit
  • 2018 Ford Flex SE 6 Cyl 3.5L Naturally Aspirated, Direct Fit; Manifold Unit
Product Details
Location : Front, Driver Side, Radiator SideEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Notes : Exhaust Manifold Included; 15 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Manifold ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyGasket Included : With GasketOxygen Sensor Ports : Factory OEM PortsOxygen Sensor Port Location : Factory OEM LocationsWarranty : 5-year or 50,000-mile AP Exhaust limited warranty on converter body and 25,000-mile limited warranty on emissionsProp 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.

Tube Material : Stainless Steel
Page 1 of 4 | Showing 1 - 15 of 50 results

Product Questions & Answers

Q:On the 2016 Taurus can this be used for the  3rd converter?
Rob W.
A:BEST ANSWERHi Rob, I'm glad to assist you. No. It is incompatible. Please confirm if you have the four or 6-cylinder engine. For us to double-check carefully and be accurate on the part you need, please provide the complete details of your vehicle (year, make, model, submodel, and engine size). The VIN would be much helpful. Show less
Jeonino E.
 
1 Question, 1 AnswerView all Q&As >

Shopping for Catalytic Converter

Catalytic Converter Shopping Info

How Much Does a Catalytic Converter Replacement Cost?

A typical catalytic converter’s cost can range from $50 to $1000 on parts alone. Prices vary depending on the brand and the specifications of your vehicle’s cat-con. Labor costs may also differ significantly between different makes and models because the amount of time it takes to install the part may vary per vehicle. Expect to spend around $70 to $130 per hour on labor. You’ll also have to factor in other expenses for related repairs.

What Is a Catalytic Converter?

A catalytic converter (or cat for short) is a critical part of your engine’s exhaust system. This device converts the harmful chemicals in the exhaust using catalysts.

Most modern models look like passageways of closely formed mesh made of honeycomb interior. Older car models are different because they feature ceramic beads instead of a honeycomb design. Their purpose is to slow down the flow of exhaust gases through the converter, allowing more time for the catalysts to interact with the emission gases.

Shop for Aftermarket Catalytic Converters on CarParts.com

CarParts.com features an extensive selection of aftermarket catalytic converters for a wide variety of makes and models. Our cat-cons are sold individually, in sets, or as part of an assembly. Filter your search by choosing from different dimensions, inlet types, and tube materials. We’re here to help you find a compatible cat-con for your vehicle.

Our catalytic converters are sourced from the top aftermarket brands in the industry. Our team of industry experts handpicks all products that make it into our catalog. These are engineered in world-class facilities and undergo strict quality checks to ensure that they can withstand harsh conditions in your exhaust system. Shop now and grab the best deal on your new catalytic converter today!

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Helpful Automotive Resources

P0430 Code: Catalyst System Efficiency Below Threshold  (Bank 2)
P0430 Code: Catalyst System Efficiency Below Threshold (Bank 2)A failing catalytic converter breaks down less pollutants in the exhaust, resulting in lower oxygen (O2) levels overall. The downstream oxygen sensor detects the change and informs the vehicle’s computer. In turn, the computer activates the check engine light and logs the appropriate OBD-II trouble code for diagnosis by a
P0042 Code: HO2S Heater Control Circuit Bank 1 Sensor 3
P0042 Code: HO2S Heater Control Circuit Bank 1 Sensor 3When there are only 3 O2 sensors it’s typically because there’s only one catalyst being monitored, and “Bank 1” is the default designation when there’s only one sensor in a category. Diagram showing 3 oxygen sensors | Image Source: Richard McCuistian
P0134: O2 Sensor Circuit No Activity Detected (Bank 1, Sensor 1)
P0134: O2 Sensor Circuit No Activity Detected (Bank 1, Sensor 1)To learn why O2 sensors need to be heated, you may read our explanation here.