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2008 GMC Sierra 1500
2008 GMC Sierra 1500 Catalytic Converters
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Part Number: JC960340
Guaranteed to Fit
$374.99
Vehicle Fitment
- 2008 GMC Sierra 1500 SL 8 Cyl 4.8L With California Emission
- 2008 GMC Sierra 1500 SLT 8 Cyl 6.0L With California Emission
- 2008 GMC Sierra 1500 SLE 8 Cyl 4.8L With California Emission
- 2008 GMC Sierra 1500 SLT 8 Cyl 5.3L With California Emission
- 2008 GMC Sierra 1500 SLE 8 Cyl 6.0L With California Emission
- 2008 GMC Sierra 1500 WT 6 Cyl 4.3L With California Emission
- 2008 GMC Sierra 1500 SLE 8 Cyl 5.3L With California Emission
- 2008 GMC Sierra 1500 WT 8 Cyl 5.3L With California Emission
- 2008 GMC Sierra 1500 WT 8 Cyl 4.8L With California Emission
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 : The item will be shipped disassembled; 40 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyEPA : N/TB6000/501-411Gasket Included : Without 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: REPC960340
Guaranteed to Fit
$278.99
Vehicle Fitment
- 2008 GMC Sierra 1500 SL 8 Cyl 4.8L 143.5 in. WheelBase, With Federal Tier 1 Emissions, For Vehicles With Federal Emissions System
- 2008 GMC Sierra 1500 SLT 8 Cyl 6.0L 143.5 in. WheelBase, With Federal Tier 1 Emissions
- 2008 GMC Sierra 1500 SLE 8 Cyl 4.8L 143.5 in. WheelBase, With Federal Tier 1 Emissions, For vehicles with Federal Emission System
- 2008 GMC Sierra 1500 SLT 8 Cyl 5.3L 157.5 in. WheelBase, With Federal Tier 1 Emissions, For vehicles with Federal Emission System
- 2008 GMC Sierra 1500 SLE 8 Cyl 6.0L 134.0 in. WheelBase, With Federal Tier 1 Emissions
- 2008 GMC Sierra 1500 WT 6 Cyl 4.3L 133.0 in. Wheelbase, With Federal Tier 1 Emissions
- 2008 GMC Sierra 1500 SLE 8 Cyl 5.3L 157.5 in. WheelBase, With Federal Tier 1 Emissions, For vehicles with Federal Emission System
- 2008 GMC Sierra 1500 WT 8 Cyl 5.3L 119.0 in. WheelBase, With Federal Tier 1 Emissions, Federal Emissions Models
- 2008 GMC Sierra 1500 WT 8 Cyl 4.8L 157.5 in. WheelBase, With Federal Tier 1 Emissions, For vehicles with Federal Emission System
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 : The item will be shipped disassembled; 40 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyEPA : N/TB6000/501-411Gasket Included : Without 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: DAV19360
Guaranteed to Fit
$568.49
Vehicle Fitment
- 2008 GMC Sierra 1500 Denali 8 Cyl 6.2L With Federal Emission
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 : 39 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: M6651206
Guaranteed to Fit
$194.00
Vehicle Fitment
- 2008 GMC Sierra 1500 Denali 8 Cyl 6.2L Cutting And Welding Required
- 2008 GMC Sierra 1500 SLE 8 Cyl 5.3L Cutting And Welding Required
- 2008 GMC Sierra 1500 WT 8 Cyl 5.3L Cutting And Welding Required
- 2008 GMC Sierra 1500 WT 8 Cyl 4.8L Cutting And Welding Required
- 2008 GMC Sierra 1500 SLE 8 Cyl 4.8L Cutting And Welding Required
- 2008 GMC Sierra 1500 SL 8 Cyl 4.8L Cutting And Welding Required
- 2008 GMC Sierra 1500 WT 6 Cyl 4.3L Cutting And Welding Required
- 2008 GMC Sierra 1500 SLT 8 Cyl 5.3L Cutting And Welding Required
Product Details
Location : 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 : 13.75 in. L x 5 in. W x 4.75 in. HRestricted 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: DAV193601
Guaranteed to Fit
$282.99
Vehicle Fitment
- 2008 GMC Sierra 1500 Denali 8 Cyl 6.2L With Federal Emission; This Part Is Split And Must Be Clamped Or Welded Together.
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 : 4 in. W x 7 in. H; 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 : 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: DAV193602
Guaranteed to Fit
$391.49
Vehicle Fitment
- 2008 GMC Sierra 1500 Denali 8 Cyl 6.2L With Federal Emission; This Part Is Split And Must Be Clamped Or Welded Together.
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 : 28 in. W x 18 in. H; 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 : 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: DAV49406
Guaranteed to Fit
$808.99
Vehicle Fitment
- 2008 GMC Sierra 1500 SL 8 Cyl 4.8L Dealer Alternative; With California Emission
- 2008 GMC Sierra 1500 SLT 8 Cyl 6.0L Dealer Alternative; With California Emission
- 2008 GMC Sierra 1500 SLE 8 Cyl 4.8L Dealer Alternative; With California Emission
- 2008 GMC Sierra 1500 SLT 8 Cyl 5.3L Dealer Alternative; With California Emission
- 2008 GMC Sierra 1500 WT 6 Cyl 4.3L Dealer Alternative; With California Emission
- 2008 GMC Sierra 1500 SLE 8 Cyl 6.0L Dealer Alternative; With California Emission
- 2008 GMC Sierra 1500 SLE 8 Cyl 5.3L Dealer Alternative; With California Emission
- 2008 GMC Sierra 1500 WT 8 Cyl 5.3L Dealer Alternative; With California Emission
- 2008 GMC Sierra 1500 WT 8 Cyl 4.8L Dealer Alternative; With California Emission
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 : 36 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: DAV19406
Guaranteed to Fit
$403.99
Vehicle Fitment
- 2008 GMC Sierra 1500 SL 8 Cyl 4.8L With California Emission
- 2008 GMC Sierra 1500 SLT 8 Cyl 6.0L With California Emission
- 2008 GMC Sierra 1500 SLE 8 Cyl 4.8L With California Emission
- 2008 GMC Sierra 1500 SLT 8 Cyl 5.3L With California Emission
- 2008 GMC Sierra 1500 SLE 8 Cyl 6.0L With California Emission
- 2008 GMC Sierra 1500 WT 6 Cyl 4.3L With California Emission
- 2008 GMC Sierra 1500 SLE 8 Cyl 5.3L With California Emission
- 2008 GMC Sierra 1500 WT 8 Cyl 5.3L With California Emission
- 2008 GMC Sierra 1500 WT 8 Cyl 4.8L With California Emission
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 : Illegal for installation in NY on vehicles equipped with California emission systems; 36 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: M6649194
Guaranteed to Fit
$613.00
Vehicle Fitment
- 2008 GMC Sierra 1500 SL 8 Cyl 4.8L
- 2008 GMC Sierra 1500 SLT 8 Cyl 6.0L
- 2008 GMC Sierra 1500 SLE 8 Cyl 4.8L
- 2008 GMC Sierra 1500 SLT 8 Cyl 5.3L
- 2008 GMC Sierra 1500 SLE 8 Cyl 6.0L
- 2008 GMC Sierra 1500 WT 6 Cyl 4.3L
- 2008 GMC Sierra 1500 SLE 8 Cyl 5.3L
- 2008 GMC Sierra 1500 WT 8 Cyl 5.3L
- 2008 GMC Sierra 1500 WT 8 Cyl 4.8L
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 : Gaskets Included; 38.75 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 : Magnaflow 5 year / 50,000 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: M6649631
Guaranteed to Fit
$980.00
Vehicle Fitment
- 2008 GMC Sierra 1500 Denali 8 Cyl 6.2L
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 : 37.5 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 : 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: M665451306
Guaranteed to Fit
$1,173.00
Vehicle Fitment
- 2008 GMC Sierra 1500 Denali 8 Cyl 6.2L EO# D-193-143; Eng Fam No: 8Gmxt06.2382; Cutting And Welding Required
- 2008 GMC Sierra 1500 WT 6 Cyl 4.3L EO# D-193-143; Eng Fam No: 8Gmxt04.3186; Cutting And Welding Required
Product Details
Location : Driver Or Passenger SideEmissions : CARB and Federal EPA Standards, 50-state LegalNotes : 13 in. overall lengthType : Catalytic ConverterProduct Fit : Semi-Universal (Welding Required)Recommended Use : OE ReplacementQuantity Sold : Sold individuallyEO Number : D-193-143Gasket Included : Without GasketWarranty : 5-year or 50,000-mile Magnaflow 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: M665551206
Guaranteed to Fit
$1,301.00
Vehicle Fitment
- 2008 GMC Sierra 1500 SL 8 Cyl 4.8L EO# D-193-144; Eng Fam No: 8Gmxt05.3380; Cutting And Welding Required
- 2008 GMC Sierra 1500 SLT 8 Cyl 6.0L EO# D-193-144; Eng Fam No: 8Gmxt06.0383; Cutting And Welding Required
- 2008 GMC Sierra 1500 SLE 8 Cyl 6.0L EO# D-193-144; Eng Fam No: 8Gmxt06.0383; Cutting And Welding Required
- 2008 GMC Sierra 1500 SLE 8 Cyl 4.8L EO# D-193-144; Eng Fam No: 8Gmxt05.3380; Cutting And Welding Required
- 2008 GMC Sierra 1500 SLT 8 Cyl 5.3L EO# D-193-144; Eng Fam No: 8Gmxt05.3381; Eng Fam No: 8Gmxt05.3380; Cutting And Welding Required
- 2008 GMC Sierra 1500 SLE 8 Cyl 5.3L EO# D-193-144; Eng Fam No: 8Gmxt05.3381; Eng Fam No: 8Gmxt05.3380; Cutting And Welding Required
- 2008 GMC Sierra 1500 WT 8 Cyl 5.3L EO# D-193-144; Eng Fam No: 8Gmxt05.3381; Eng Fam No: 8Gmxt05.3380; Cutting And Welding Required
- 2008 GMC Sierra 1500 WT 8 Cyl 4.8L EO# D-193-144; Eng Fam No: 8Gmxt05.3380; Cutting And Welding Required
Product Details
Location : Driver Or Passenger SideEmissions : CARB and Federal EPA Standards, 50-state LegalNotes : 9 in. overall lengthType : Catalytic ConverterProduct Fit : Semi-Universal (Welding Required)Recommended Use : OE ReplacementQuantity Sold : Sold individuallyEO Number : D-193-144Gasket Included : Without GasketWarranty : 5-year or 50,000-mile Magnaflow 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: M665551194
Guaranteed to Fit
$4,048.00
Vehicle Fitment
- 2008 GMC Sierra 1500 SL 8 Cyl 4.8L EO# D-193-144; Eng Fam No: 8Gmxt05.3380
- 2008 GMC Sierra 1500 SLT 8 Cyl 6.0L EO# D-193-144; Eng Fam No: 8Gmxt06.0383
- 2008 GMC Sierra 1500 SLE 8 Cyl 4.8L EO# D-193-144; Eng Fam No: 8Gmxt05.3380
- 2008 GMC Sierra 1500 SLT 8 Cyl 5.3L EO# D-193-144; Eng Fam No: 8Gmxt05.3381; Eng Fam No: 8Gmxt05.3380
- 2008 GMC Sierra 1500 SLE 8 Cyl 6.0L EO# D-193-144; Eng Fam No: 8Gmxt06.0383
- 2008 GMC Sierra 1500 SLE 8 Cyl 5.3L EO# D-193-144; Eng Fam No: 8Gmxt05.3381; Eng Fam No: 8Gmxt05.3380
- 2008 GMC Sierra 1500 WT 8 Cyl 5.3L EO# D-193-144; Eng Fam No: 8Gmxt05.3381; Eng Fam No: 8Gmxt05.3380
- 2008 GMC Sierra 1500 WT 8 Cyl 4.8L EO# D-193-144; Eng Fam No: 8Gmxt05.3380
Product Details
Emissions : CARB and Federal EPA Standards, 50-state LegalNotes : Direct Fit Type; Mandrel Bent Tube; Stainless Steel Construction; Ceramic Substrate Material; 45 in. overall lengthType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyEO Number : D-193-144Gasket 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: APE645291
Guaranteed to Fit
$716.99
Vehicle Fitment
- 2008 GMC Sierra 1500 Denali 8 Cyl 6.2L Direct Fit
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: APE645459
Guaranteed to Fit
$465.99
Vehicle Fitment
- 2008 GMC Sierra 1500 SL 8 Cyl 4.8L Direct Fit; Except Classic Model
- 2008 GMC Sierra 1500 SLT 8 Cyl 6.0L Direct Fit; Except Classic Model
- 2008 GMC Sierra 1500 SLE 8 Cyl 4.8L Direct Fit; Except Classic Model
- 2008 GMC Sierra 1500 SLT 8 Cyl 5.3L Direct Fit; Except Classic Model
- 2008 GMC Sierra 1500 SLE 8 Cyl 6.0L Direct Fit; Except Classic Model
- 2008 GMC Sierra 1500 WT 6 Cyl 4.3L Direct Fit; Except Classic Model
- 2008 GMC Sierra 1500 SLE 8 Cyl 5.3L Direct Fit; Except Classic Model
- 2008 GMC Sierra 1500 WT 8 Cyl 5.3L Direct Fit; Except Classic Model
- 2008 GMC Sierra 1500 WT 8 Cyl 4.8L Direct Fit; Except Classic Model
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 : 36 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.
Page 1 of 4 | Showing 1 - 15 of 55 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