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2013 GMC Sierra 2500 HD
2013 GMC Sierra 2500 HD Catalytic Converters
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Part Number: EC96030023
Guaranteed to Fit
$757.99
Vehicle Fitment
- 2013 GMC Sierra 2500 HD WT 8 Cyl 6.0L Crew Cab Pickup, ULEV Emission, With 2 Converter System, Undercar
- 2013 GMC Sierra 2500 HD Denali 8 Cyl 6.0L Crew Cab Pickup, ULEV Emission, With 2 Converter System, Undercar
- 2013 GMC Sierra 2500 HD SLE 8 Cyl 6.0L Standard Cab Pickup, ULEV Emission, With 2 Converter System, Undercar
- 2013 GMC Sierra 2500 HD SLT 8 Cyl 6.0L Crew Cab Pickup, ULEV Emission, With 2 Converter System, Undercar
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)Restricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyOxygen 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: DAV19588
Guaranteed to Fit
$604.99
Vehicle Fitment
- 2013 GMC Sierra 2500 HD SLE 8 Cyl 6.0L Standard Cab Pickup, Y Pipe With 3 Converter
- 2013 GMC Sierra 2500 HD WT 8 Cyl 6.0L Crew Cab Pickup, Y Pipe With 3 Converter
- 2013 GMC Sierra 2500 HD SLT 8 Cyl 6.0L Extended Cab Pickup, Y Pipe With 3 Converter
- 2013 GMC Sierra 2500 HD Denali 8 Cyl 6.0L Crew Cab Pickup, Y Pipe With 3 Converter
Product Details
Location : CenterEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Notes : Without air tube port provision; 60.5 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 : 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: 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: M6651659
Guaranteed to Fit
$281.00
Vehicle Fitment
- 2013 GMC Sierra 2500 HD WT 8 Cyl 6.0L Standard Cab Pickup
- 2013 GMC Sierra 2500 HD Denali 8 Cyl 6.0L Crew Cab Pickup
- 2013 GMC Sierra 2500 HD SLT 8 Cyl 6.0L Extended Cab Pickup
- 2013 GMC Sierra 2500 HD SLE 8 Cyl 6.0L Standard Cab Pickup
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 : 3 in. Inlet/OutletProduct Fit : Semi-Universal (Welding Required)Recommended Use : Performance ReplacementQuantity Sold : Sold individuallyGasket Included : Without GasketOxygen Sensor Ports : Factory OEM PortsOxygen Sensor Port Location : Factory OEM LocationsWarranty : Magnaflow 25,000 Mile 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: M6651812
Guaranteed to Fit
$1,509.00
Vehicle Fitment
- 2013 GMC Sierra 2500 HD WT 8 Cyl 6.0L Standard Cab Pickup, For Vehicles Originally Equipped With 3 Catalytic Converter
- 2013 GMC Sierra 2500 HD SLE 8 Cyl 6.0L Crew Cab Pickup, For Vehicles Originally Equipped With 3 Catalytic Converter
- 2013 GMC Sierra 2500 HD Denali 8 Cyl 6.0L Crew Cab Pickup, For Vehicles Originally Equipped With 3 Catalytic Converter
- 2013 GMC Sierra 2500 HD SLT 8 Cyl 6.0L Extended Cab Pickup, For Vehicles Originally Equipped With 3 Catalytic Converter
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 : 63.88 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyGasket Included : Without 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: M664551252
Guaranteed to Fit
$3,545.00
Vehicle Fitment
- 2013 GMC Sierra 2500 HD WT 8 Cyl 6.0L EO# D-193-145; For Vehicles Originally Equipped With 2 Catalytic Converter; Eng Fam No: Dgmxe06.0584; Eng Fam No: Dldre06.0C11
- 2013 GMC Sierra 2500 HD Denali 8 Cyl 6.0L EO# D-193-145; For Vehicles Originally Equipped With 2 Catalytic Converter; Eng Fam No: Dgmxe06.0584; Eng Fam No: Dldre06.0C11
- 2013 GMC Sierra 2500 HD SLE 8 Cyl 6.0L EO# D-193-145; For Vehicles Originally Equipped With 2 Catalytic Converter; Eng Fam No: Dgmxe06.0584; Eng Fam No: Dldre06.0C11
- 2013 GMC Sierra 2500 HD SLT 8 Cyl 6.0L EO# D-193-145; For Vehicles Originally Equipped With 2 Catalytic Converter; Eng Fam No: Dgmxe06.0584; Eng Fam No: Dldre06.0C11
Product Details
Emissions : CARB and Federal EPA Standards, 50-state LegalNotes : (2) Converter Quantity; 3 in. Main Piping Diameter; 10.75 in. Body Length x 4 in. Body Width x 4 in. Body Height; 3 in. ID x 3.5 in. OD; Round Body Shape; Spun Body Type; Bolt-On Inlet and Outlet Attachment; Stainless Steel Material; Pre and Post Converter; Includes Clamp and Hangers; 62.88 in. overall lengthType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyEO Number : D-193-145Gasket Included : Without 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: M665582812
Guaranteed to Fit
$5,457.00
Vehicle Fitment
- 2013 GMC Sierra 2500 HD SLE 8 Cyl 6.0L Crew Cab Pickup, EO# D-193-148; Eng Fam No: Dgmxt06.0396
- 2013 GMC Sierra 2500 HD WT 8 Cyl 6.0L Standard Cab Pickup, EO# D-193-148; Eng Fam No: Dgmxt06.0396
- 2013 GMC Sierra 2500 HD SLT 8 Cyl 6.0L Extended Cab Pickup, EO# D-193-148; Eng Fam No: Dgmxt06.0396
- 2013 GMC Sierra 2500 HD Denali 8 Cyl 6.0L Crew Cab Pickup, EO# D-193-148; Eng Fam No: Dgmxt06.0396
Product Details
Emissions : CARB and Federal EPA Standards, 50-state LegalNotes : (3) Converter Quantity; 3 in. Main Piping Diameter; x 5 in. Body Width x 5 in. Body Height; 3 in. ID x 3.5 in. OD; Round Body Shape; Spun Body Type; Bolt-On Inlet and Outlet Attachment; Stainless Steel Material; Pre and Post Converter; Includes Clamp and Hangers; 63.75 in. overall lengthType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyEO Number : D-193-148Gasket Included : Without 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: M6621252
Guaranteed to Fit
$927.00
Vehicle Fitment
- 2013 GMC Sierra 2500 HD WT 8 Cyl 6.0L With Dual Catalytic Converters
- 2013 GMC Sierra 2500 HD SLE 8 Cyl 6.0L With Dual Catalytic Converters
- 2013 GMC Sierra 2500 HD Denali 8 Cyl 6.0L With Dual Catalytic Converters
- 2013 GMC Sierra 2500 HD SLT 8 Cyl 6.0L With Dual Catalytic Converters
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 : 64.5 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyGasket Included : Without 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: EAST50486
Guaranteed to Fit
$612.99
Vehicle Fitment
- 2013 GMC Sierra 2500 HD WT 8 Cyl 6.0L Crew Cab Pickup, ULEV Emission, With 2 Converter System, Undercar
- 2013 GMC Sierra 2500 HD Denali 8 Cyl 6.0L Crew Cab Pickup, ULEV Emission, With 2 Converter System, Undercar
- 2013 GMC Sierra 2500 HD SLE 8 Cyl 6.0L Standard Cab Pickup, ULEV Emission, With 2 Converter System, Undercar
- 2013 GMC Sierra 2500 HD SLT 8 Cyl 6.0L Crew Cab Pickup, ULEV Emission, With 2 Converter System, Undercar
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 : 34 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 Eastern 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: APE645184
Guaranteed to Fit
$631.49
Vehicle Fitment
- 2013 GMC Sierra 2500 HD WT 8 Cyl 6.0L Extended Cab Pickup, Direct Fit; ULEV Emissions, With 2 Conv. Bodies
- 2013 GMC Sierra 2500 HD Denali 8 Cyl 6.0L Crew Cab Pickup, Direct Fit; ULEV Emissions, With 2 Conv. Bodies
- 2013 GMC Sierra 2500 HD SLE 8 Cyl 6.0L Extended Cab Pickup, Direct Fit; ULEV Emissions, With 2 Conv. Bodies
- 2013 GMC Sierra 2500 HD SLT 8 Cyl 6.0L Crew Cab Pickup, Direct Fit; ULEV Emissions, With 2 Conv. Bodies
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 : 34 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 AP Exhaust limited warranty on converter body and 25,000-mile 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: WK50572
Guaranteed to Fit
$788.49
Vehicle Fitment
- 2013 GMC Sierra 2500 HD WT 8 Cyl 6.0L Vehicles With 3 converter bodies, Fits Fed. & Calif. Emiss. Models, Additional Parts Needed: 31718, 31657
- 2013 GMC Sierra 2500 HD Denali 8 Cyl 6.0L Vehicles With 3 converter bodies, Fits Fed. & Calif. Emiss. Models, Additional Parts Needed: 31718, 31657
- 2013 GMC Sierra 2500 HD SLE 8 Cyl 6.0L Vehicles With 3 converter bodies, Fits Fed. & Calif. Emiss. Models, Additional Parts Needed: 31718, 31657
- 2013 GMC Sierra 2500 HD SLT 8 Cyl 6.0L Vehicles With 3 converter bodies, Fits Fed. & Calif. Emiss. Models, Additional Parts Needed: 31718, 31657
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 : 10 in. Body Length; 4.5 in. Body Width; 6.5 in. Body Height; 4.13 in. Inlet ID; 1 Outlet Quantity; 3.52 in. Outlet OD; 2 Bolt Welded Flange Outlet Type; Stainless Steel Material; Round And Standard Oval Body Shape; Does not include Mounting Hardware; 58.25 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Catalytic 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: 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: EAST70857
Guaranteed to Fit
$239.49
Vehicle Fitment
- 2013 GMC Sierra 2500 HD SLE 8 Cyl 6.0L
- 2013 GMC Sierra 2500 HD WT 8 Cyl 6.0L
- 2013 GMC Sierra 2500 HD Denali 8 Cyl 6.0L
- 2013 GMC Sierra 2500 HD SLT 8 Cyl 6.0L
Product Details
Location : Front, 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 : 3 in. Inlet and Outlet Diameter; Without O2 Sensor Port; 16 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: 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: CAT9545
Guaranteed to Fit
$710.99
Vehicle Fitment
- 2013 GMC Sierra 2500 HD WT 8 Cyl 6.0L Crew Cab Pickup, ULEV Emissions, with 2 Conv. Bodies, Federal and California Emissions
- 2013 GMC Sierra 2500 HD Denali 8 Cyl 6.0L Crew Cab Pickup, ULEV Emissions, with 2 Conv. Bodies, Federal and California Emissions
- 2013 GMC Sierra 2500 HD SLE 8 Cyl 6.0L Extended Cab Pickup, ULEV Emissions, with 2 Conv. Bodies, Federal and California Emissions
- 2013 GMC Sierra 2500 HD SLT 8 Cyl 6.0L Extended Cab Pickup, ULEV Emissions, with 2 Conv. Bodies, Federal and California Emissions
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 : 34 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyGasket 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: 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: WK50571
Guaranteed to Fit
$748.49
Vehicle Fitment
- 2013 GMC Sierra 2500 HD WT 8 Cyl 6.0L Vehicles With 2 converter bodies, Fits Fed. & Calif. Emiss. Models, Additional Parts Needed: 31718, 31657
- 2013 GMC Sierra 2500 HD Denali 8 Cyl 6.0L Vehicles With 2 converter bodies, Fits Fed. & Calif. Emiss. Models, Additional Parts Needed: 31718, 31657
- 2013 GMC Sierra 2500 HD SLE 8 Cyl 6.0L Vehicles With 2 converter bodies, Fits Fed. & Calif. Emiss. Models, Additional Parts Needed: 31718, 31657
- 2013 GMC Sierra 2500 HD SLT 8 Cyl 6.0L Vehicles With 2 converter bodies, Fits Fed. & Calif. Emiss. Models, Additional Parts Needed: 31718, 31657
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 : 10 in. Body Length; 4.5 in. Body Width; 6.5 in. Body Height; 4.13 in. Inlet ID; 1 Outlet Quantity; 3.52 in. Outlet OD; 2 Bolt Welded Flange Outlet Type; Stainless Steel Material; Standard Oval Body Shape; Does not include Mounting Hardware; 58.25 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Catalytic 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: 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: APE776371
Guaranteed to Fit
$2,297.49
Vehicle Fitment
- 2013 GMC Sierra 2500 HD WT 8 Cyl 6.0L EFN No. DGMXE06.0584
- 2013 GMC Sierra 2500 HD Denali 8 Cyl 6.0L EFN No. DGMXE06.0584
- 2013 GMC Sierra 2500 HD SLE 8 Cyl 6.0L EFN No. DGMXE06.0584
- 2013 GMC Sierra 2500 HD SLT 8 Cyl 6.0L EFN No. DGMXE06.0584
Product Details
Emissions : CARB and Federal EPA Standards, 50-state LegalType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyEO Number : D-798-15Gasket Included : Without GasketOxygen Sensor Ports : 4 Sensor PortsOxygen Sensor Port Location : Factory OEM LocationsWarranty : 5-year or 50,000-mile AP Exhaust limited warranty on converter body and 50,000-mile 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: CAT776371
Guaranteed to Fit
$2,468.49
Vehicle Fitment
- 2013 GMC Sierra 2500 HD WT 8 Cyl 6.0L DGMXE06.0584; EO Number : D-798-15
- 2013 GMC Sierra 2500 HD Denali 8 Cyl 6.0L DGMXE06.0584; EO Number : D-798-15
- 2013 GMC Sierra 2500 HD SLE 8 Cyl 6.0L DGMXE06.0584; EO Number : D-798-15
- 2013 GMC Sierra 2500 HD SLT 8 Cyl 6.0L DGMXE06.0584; EO Number : D-798-15
Product Details
Emissions : CARB and Federal EPA Standards, 50-state LegalType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyEO Number : D-798-15Gasket 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: 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 3 | Showing 1 - 15 of 44 results
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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