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2018 Nissan Frontier
2018 Nissan Frontier Catalytic Converters
If your catalytic converter is clogged up or looks melted, you should replace it right away. Good thing you can order an affordable 2018 Nissan Frontier catalytic converter here at CarParts.com. Our great selection of parts here at CarParts.com come from only the most reliable manufacturers in the automotive aftermarket industry, ensuring quality and durability. Get the best bang for your buck and buy a new 2018 Nissan Frontier catalytic converter here at CarParts.com today.
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Part Number: JN960346
Guaranteed to Fit
$154.99
Vehicle Fitment
- 2018 Nissan Frontier SL 6 Cyl 4.0L Direct Fit
- 2018 Nissan Frontier SV 6 Cyl 4.0L Direct Fit
- 2018 Nissan Frontier Desert Runner 6 Cyl 4.0L Direct Fit
- 2018 Nissan Frontier PRO-4X 6 Cyl 4.0L Direct Fit
- 2018 Nissan Frontier S 6 Cyl 4.0L Direct Fit
Product Details
Location : Rear, 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 : 27.25 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyEPA : N/TB6000/64805NNGasket Included : With GasketOxygen Sensor Ports : Factory OE PortsOxygen Sensor Port Location : Factory OE LocationsWarranty : 5-year or 50,000-mile JC Whitney limited warrantyReturns Policy : 30-Day Return PolicyProp 65 Warning :
WARNING: 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.
Part Number: REPN960345
Guaranteed to Fit
$210.73
Vehicle Fitment
- 2018 Nissan Frontier SL 6 Cyl 4.0L
- 2018 Nissan Frontier SV 6 Cyl 4.0L
- 2018 Nissan Frontier Desert Runner 6 Cyl 4.0L
- 2018 Nissan Frontier PRO-4X 6 Cyl 4.0L
- 2018 Nissan Frontier S 6 Cyl 4.0L
Product Details
Location : Rear, 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 : 29 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyEPA : N/TB6000/64805NNGasket Included : With GasketOxygen Sensor Ports : Factory OE 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: 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.
Part Number: REPN960346
Guaranteed to Fit
$144.40
Vehicle Fitment
- 2018 Nissan Frontier SL 6 Cyl 4.0L
- 2018 Nissan Frontier SV 6 Cyl 4.0L
- 2018 Nissan Frontier Desert Runner 6 Cyl 4.0L
- 2018 Nissan Frontier PRO-4X 6 Cyl 4.0L
- 2018 Nissan Frontier S 6 Cyl 4.0L
Product Details
Location : Rear, 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 : 27.25 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyEPA : N/TB6000/64805NNGasket Included : With GasketOxygen Sensor Ports : Factory OE 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: 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.
Part Number: SET-REPN960345
Guaranteed to Fit
$347.99
Vehicle Fitment
- 2018 Nissan Frontier SL 6 Cyl 4.0L
- 2018 Nissan Frontier SV 6 Cyl 4.0L
- 2018 Nissan Frontier Desert Runner 6 Cyl 4.0L
- 2018 Nissan Frontier PRO-4X 6 Cyl 4.0L
- 2018 Nissan Frontier S 6 Cyl 4.0L
Product Details
Location : Rear, Driver and Passenger SideEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Components : (1) Rear Driver Side Catalytic Converter, (1) Rear Passenger Side Catalytic ConverterRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Set of 2EPA : N/TB6000/64805NNGasket Included : With GasketOxygen Sensor Ports : Factory OE 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: 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.
Part Number: M665582668
Guaranteed to Fit
$1,888.00
Vehicle Fitment
- 2018 Nissan Frontier SL 6 Cyl 4.0L EO# D-193-148; Eng Fam No: Jnsxt04.0N6A
- 2018 Nissan Frontier SV 6 Cyl 4.0L EO# D-193-148; Eng Fam No: Jnsxt04.0N6A
- 2018 Nissan Frontier Desert Runner 6 Cyl 4.0L EO# D-193-148; Eng Fam No: Jnsxt04.0N6A
- 2018 Nissan Frontier PRO-4X 6 Cyl 4.0L EO# D-193-148; Eng Fam No: Jnsxt04.0N6A
- 2018 Nissan Frontier S 6 Cyl 4.0L EO# D-193-148; Eng Fam No: Jnsxt04.0N6A
Product Details
Location : Front, Passenger SideEmissions : CARB and Federal EPA Standards, 50-state LegalNotes : (1) Converter Quantity; 2.25 in. Main Piping Diameter; 9.13 in. Body Length x 4 in. Body Width x 4 in. Body Height; 2.25 in. ID x 2.25 in. OD; Round Body Shape; Spun Body Type; Bolt-On Inlet and Outlet Attachment; Stainless Steel Material; Pre Converter; Includes Gasket; 13.25 in. overall lengthType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyEO Number : D-193-148Gasket Included : With GasketOxygen Sensor Ports : Factory OEM PortsOxygen Sensor Port Location : Factory OEM LocationsWarranty : 5-year or 50,000-mile Magnaflow limited warrantyReturns Policy : 30-Day Return PolicyProp 65 Warning :
WARNING: 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.
Part Number: M6651205
Guaranteed to Fit
$194.00
Vehicle Fitment
- 2018 Nissan Frontier S 4 Cyl 2.5L Cutting And Welding Required
- 2018 Nissan Frontier SV 4 Cyl 2.5L Cutting And Welding Required
Product Details
Emissions : Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Notes : 2.25 in. Inlet/Outlet; 13 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 : Magnaflow 5 year / 50,000 Mile Limited WarrantyReturns Policy : NON-RETURNABLEProp 65 Warning :
WARNING: 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.
Part Number: M6651596
Guaranteed to Fit
$635.00
Vehicle Fitment
- 2018 Nissan Frontier S 4 Cyl 2.5L
- 2018 Nissan Frontier SV 4 Cyl 2.5L
Product Details
Emissions : Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Notes : 19.13 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 Magnaflow limited warranty on Construction; 25,000-mile Magnaflow limited warranty on EmissionsProp 65 Warning :
WARNING: 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.
Part Number: M6652665
Guaranteed to Fit
$582.00
Vehicle Fitment
- 2018 Nissan Frontier SL 6 Cyl 4.0L
- 2018 Nissan Frontier SV 6 Cyl 4.0L
- 2018 Nissan Frontier Desert Runner 6 Cyl 4.0L
- 2018 Nissan Frontier PRO-4X 6 Cyl 4.0L
- 2018 Nissan Frontier S 6 Cyl 4.0L
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 : 11.88 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: 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.
Part Number: M6652669
Guaranteed to Fit
$294.00
Vehicle Fitment
- 2018 Nissan Frontier SL 6 Cyl 4.0L
- 2018 Nissan Frontier SV 6 Cyl 4.0L
- 2018 Nissan Frontier Desert Runner 6 Cyl 4.0L
- 2018 Nissan Frontier PRO-4X 6 Cyl 4.0L
- 2018 Nissan Frontier S 6 Cyl 4.0L
Product Details
Location : Rear, 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 : 28.25 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: 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.
Part Number: M6652670
Guaranteed to Fit
$295.00
Vehicle Fitment
- 2018 Nissan Frontier SL 6 Cyl 4.0L
- 2018 Nissan Frontier SV 6 Cyl 4.0L
- 2018 Nissan Frontier Desert Runner 6 Cyl 4.0L
- 2018 Nissan Frontier PRO-4X 6 Cyl 4.0L
- 2018 Nissan Frontier S 6 Cyl 4.0L
Product Details
Location : Rear, 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 : 27.13 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: 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.
Part Number: M6652668
Guaranteed to Fit
$551.00
Vehicle Fitment
- 2018 Nissan Frontier SL 6 Cyl 4.0L
- 2018 Nissan Frontier SV 6 Cyl 4.0L
- 2018 Nissan Frontier Desert Runner 6 Cyl 4.0L
- 2018 Nissan Frontier PRO-4X 6 Cyl 4.0L
- 2018 Nissan Frontier S 6 Cyl 4.0L
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 : 13.5 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: 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.
Part Number: M665592670
Guaranteed to Fit
$1,083.00
Vehicle Fitment
- 2018 Nissan Frontier SL 6 Cyl 4.0L EO# D-193-148; Eng Fam No: Jnsxt04.0N6A
- 2018 Nissan Frontier SV 6 Cyl 4.0L EO# D-193-148; Eng Fam No: Jnsxt04.0N6A
- 2018 Nissan Frontier Desert Runner 6 Cyl 4.0L EO# D-193-148; Eng Fam No: Jnsxt04.0N6A
- 2018 Nissan Frontier PRO-4X 6 Cyl 4.0L EO# D-193-148; Eng Fam No: Jnsxt04.0N6A
- 2018 Nissan Frontier S 6 Cyl 4.0L EO# D-193-148; Eng Fam No: Jnsxt04.0N6A
Product Details
Location : Rear, Passenger SideEmissions : CARB and Federal EPA Standards, 50-state LegalNotes : (1) Converter Quantity; 2 in. Main Piping Diameter; 9.38 in. Body Length x 4 in. Body Width x 4 in. Body Height; 2 in. ID x 2 in. OD; Round Body Shape; Spun Body Type; Bolt-On Inlet and Outlet Attachment; Stainless Steel Material; Pre Converter; Includes Gasket; 27.25 in. overall lengthType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyEO Number : D-193-148Gasket Included : With GasketOxygen Sensor Ports : Factory OEM PortsOxygen Sensor Port Location : Factory OEM LocationsWarranty : 5-year or 50,000-mile Magnaflow limited warrantyProp 65 Warning :
WARNING: 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.
Part Number: M665592669
Guaranteed to Fit
$1,190.00
Vehicle Fitment
- 2018 Nissan Frontier SL 6 Cyl 4.0L EO# D-193-148; Eng Fam No: Jnsxt04.0N6A
- 2018 Nissan Frontier SV 6 Cyl 4.0L EO# D-193-148; Eng Fam No: Jnsxt04.0N6A
- 2018 Nissan Frontier Desert Runner 6 Cyl 4.0L EO# D-193-148; Eng Fam No: Jnsxt04.0N6A
- 2018 Nissan Frontier PRO-4X 6 Cyl 4.0L EO# D-193-148; Eng Fam No: Jnsxt04.0N6A
- 2018 Nissan Frontier S 6 Cyl 4.0L EO# D-193-148; Eng Fam No: Jnsxt04.0N6A
Product Details
Location : Rear, Driver SideEmissions : CARB and Federal EPA Standards, 50-state LegalNotes : (1) Converter Quantity; 2 in. Main Piping Diameter; 9.38 in. Body Length x 4 in. Body Width x 4 in. Body Height; 2 in. ID x 2 in. OD; Round Body Shape; Spun Body Type; Bolt-On Inlet and Outlet Attachment; Stainless Steel Material; Pre Converter; Includes Gasket; 28.5 in. overall lengthType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyEO Number : D-193-148Gasket Included : With GasketOxygen Sensor Ports : Factory OEM PortsOxygen Sensor Port Location : Factory OEM LocationsWarranty : 5-year or 50,000-mile Magnaflow limited warrantyProp 65 Warning :
WARNING: 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.
Part Number: M6651204
Guaranteed to Fit
$194.00
Vehicle Fitment
- 2018 Nissan Frontier Desert Runner 6 Cyl 4.0L Cutting And Welding Required
- 2018 Nissan Frontier SL 6 Cyl 4.0L Cutting And Welding Required
- 2018 Nissan Frontier S 6 Cyl 4.0L Cutting And Welding Required
- 2018 Nissan Frontier SV 6 Cyl 4.0L Cutting And Welding Required
- 2018 Nissan Frontier PRO-4X 6 Cyl 4.0L Cutting And Welding Required
Product Details
Location : Rear, Driver or 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 : 2 in. Inlet/Outlet; 13 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 : Magnaflow 5 year / 50,000 Mile Limited WarrantyReturns Policy : NON-RETURNABLEProp 65 Warning :
WARNING: 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.
Part Number: M665582665
Guaranteed to Fit
$1,888.00
Vehicle Fitment
- 2018 Nissan Frontier SL 6 Cyl 4.0L EO# D-193-148; Eng Fam No: Jnsxt04.0N6A
- 2018 Nissan Frontier SV 6 Cyl 4.0L EO# D-193-148; Eng Fam No: Jnsxt04.0N6A
- 2018 Nissan Frontier Desert Runner 6 Cyl 4.0L EO# D-193-148; Eng Fam No: Jnsxt04.0N6A
- 2018 Nissan Frontier PRO-4X 6 Cyl 4.0L EO# D-193-148; Eng Fam No: Jnsxt04.0N6A
- 2018 Nissan Frontier S 6 Cyl 4.0L EO# D-193-148; Eng Fam No: Jnsxt04.0N6A
Product Details
Location : Front, Driver SideEmissions : CARB and Federal EPA Standards, 50-state LegalNotes : (1) Converter Quantity; 2.25 in. Main Piping Diameter; 9.13 in. Body Length x 4 in. Body Width x 4 in. Body Height; 2.25 in. ID x 2.25 in. OD; Round Body Shape; Spun Body Type; Bolt-On Inlet and Outlet Attachment; Stainless Steel Material; Pre Converter; Includes Gasket; 12.38 in. overall lengthType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyEO Number : D-193-148Gasket Included : With GasketOxygen Sensor Ports : Factory OEM PortsOxygen Sensor Port Location : Factory OEM LocationsWarranty : 5-year or 50,000-mile Magnaflow limited warrantyProp 65 Warning :
WARNING: 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 5 | Showing 1 - 15 of 70 results
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The AP Exhaust catalytic converter has an eco-friendly and energy-efficient design to support maximum pollu...
MagnaflowFront, Passenger Side California Series Direct Fit Catalytic Converter, CARB and Federal EPA Standards, 50-state LegalManufacturer #5582668
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MAGNAFLOW CATALYTIC CONVERTER
Meticulously constructed with premium stainless steel, MagnaFlow’s catalytic converter is engineered to deliver a precise fit for easy, bolt-on installation. MagnaFlow is one of the world’s largest manufacturers...
FlowmasterNo Returns Accepted, Universal Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Manufacturer #2000120
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FLOWMASTER CATALYTIC CONVERTER
Expertly crafted and tested to top-grade, OE-specific standards, Flowmaster Catalytic Converter provides high quality performance without the high level price. Its OE-standard design provides the right fit and the right solut...
EasternRear, Passenger 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)Manufacturer #40746
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FEDERAL EPA STANDARD, 46-STATE LEGAL (CANNOT SHIP TO OR BE USED IN VEHICLES ORIGINALLY PURCHASED IN CA, CO, NY OR ME) DIRECT FIT EASTERN CATALYTIC CONVERTER
- MADE IN USA
- Choose from direct-fit, semi-universal or universal catalytic converters
Product Questions & Answers
Q:if ordered for mercedes ml430 is this front or back left or right?
coverdude
A:BEST ANSWERHi Raymond, thank you for reaching out. We need more information. Kindly call our parts team at 1-866-529-0412 and provide the VIN and emission information of the ML430. Have a good one! Show less
Andrew B.
4 Questions, 1 AnswerView all Q&As >
Related Parts
Helpful Automotive Resources
P0430 Code: Catalyst System Efficiency Below Threshold (Bank 2)In most cases, a vehicle with an inefficient catalytic converter will continue to run just fine. But if the converter is obstructed internally, it can cause poor engine performance and may even damage the engine in the long run.
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.
Can You Drive Without a Catalytic Converter?Technically, yes. Older cars ran just fine before catalytic converters became commonplace in the 1970s. So, if your question is whether your car will run without one, then it most certainly will. But the other question you should be asking is—should you risk it?
Removing or disabling the catalytic converter could
P0316 Code: Engine Misfire Detected on Startup (First 1000 Revolutions)The PCM may disable the misfiring cylinder or cylinders in order to prevent further damage to the engine. Code P0316 is often listed in addition to one or more of the P0300 series codes that are associated with the misfiring cylinder/s.
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.
How to Tell If the Catalytic Converter is CloggedA clogged catalytic converter will present symptoms, while a chemically failed cat con that’s not clogged typically just illuminates the check engine light or malfunction indicator lamp (MIL). Also, if the cat con that just fails chemically but doesn’t clog is not the light-off cat con (the cat con closest