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1986 GMC C1500 Suburban
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1986 GMC C1500 Suburban

1986 GMC C1500 Suburban Catalytic Converters

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Standard Grade Series Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Magnaflow®
Standard Grade Series 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: M6693432
Guaranteed to Fit
$201.00
Vehicle Fitment
  • 1986 GMC C1500 Suburban High Sierra 8 Cyl 5.0L
  • 1986 GMC C1500 Suburban Sierra Classic 8 Cyl 5.0L
  • 1986 GMC C1500 Suburban High Sierra 8 Cyl 5.7L
  • 1986 GMC C1500 Suburban Sierra Classic 8 Cyl 5.7L
  • 1986 GMC C1500 Suburban Base 8 Cyl 5.7L
  • 1986 GMC C1500 Suburban Base 8 Cyl 5.0L
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 : 24.75 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 : Magnaflow 25,000 Mile 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 : Standard Grade SeriesTube Material : Stainless Steel
California Series Catalytic Converter, CARB and Federal EPA Standards, 50-state Legal
Magnaflow®
California Series Catalytic Converter, CARB and Federal EPA Standards, 50-state Legal
Part Number: M663391006
Guaranteed to Fit
$1,128.00
Vehicle Fitment
  • 1986 GMC C1500 Suburban High Sierra 8 Cyl 5.7L
  • 1986 GMC C1500 Suburban Base 8 Cyl 5.0L
  • 1986 GMC C1500 Suburban High Sierra 8 Cyl 5.0L
  • 1986 GMC C1500 Suburban Sierra Classic 8 Cyl 5.0L
  • 1986 GMC C1500 Suburban Sierra Classic 8 Cyl 5.7L
  • 1986 GMC C1500 Suburban Base 8 Cyl 5.7L
Product Details
Emissions : CARB and Federal EPA Standards, 50-state LegalProduct Fit : Direct FitRecommended Use : Performance ReplacementQuantity Sold : Sold individuallyEO Number : D-193-132Gasket 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 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 : California SeriesTube Material : Stainless Steel
No Returns Accepted - Catalytic Converter, CARB and Federal EPA Standards, 50-state Legal, Semi-Universal (Welding Required)
Magnaflow®
No Returns Accepted - Catalytic Converter, CARB and Federal EPA Standards, 50-state Legal, Semi-Universal (Welding Required)
Part Number: M66339106
Guaranteed to Fit
$480.00
Vehicle Fitment
  • 1986 GMC C1500 Suburban High Sierra 8 Cyl 5.7L EO# D-193-105; Cutting And Welding Required
  • 1986 GMC C1500 Suburban Base 8 Cyl 5.0L EO# D-193-105; Cutting And Welding Required
  • 1986 GMC C1500 Suburban High Sierra 8 Cyl 5.0L EO# D-193-105; Cutting And Welding Required
  • 1986 GMC C1500 Suburban Sierra Classic 8 Cyl 5.0L EO# D-193-105; Cutting And Welding Required
  • 1986 GMC C1500 Suburban Sierra Classic 8 Cyl 5.7L EO# D-193-105; Cutting And Welding Required
  • 1986 GMC C1500 Suburban Base 8 Cyl 5.7L EO# D-193-105; Cutting And Welding Required
Product Details
Emissions : CARB and Federal EPA Standards, 50-state LegalNotes : 16 in. overall lengthType : Catalytic ConverterProduct Fit : Semi-Universal (Welding Required)Recommended Use : OE ReplacementQuantity Sold : Sold individuallyEO Number : D-193-105Gasket Included : Without GasketWarranty : 5-year or 50,000-mile Magnaflow 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 : California 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)
Eastern®
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: EAST70318
Guaranteed to Fit
$112.49
Vehicle Fitment
  • 1986 GMC C1500 Suburban High Sierra 8 Cyl 5.7L RWD, Undercar
  • 1986 GMC C1500 Suburban Base 8 Cyl 5.0L RWD, Undercar
  • 1986 GMC C1500 Suburban High Sierra 8 Cyl 5.0L RWD, Undercar
  • 1986 GMC C1500 Suburban Sierra Classic 8 Cyl 5.0L RWD, Undercar
  • 1986 GMC C1500 Suburban Sierra Classic 8 Cyl 5.7L RWD, Undercar
  • 1986 GMC C1500 Suburban Base 8 Cyl 5.7L RWD, 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 : 14" in. Overall Length; 2.5 in. ID Inlet Type A; 2.5 in. ID Outlet Type A; Standard Catalyst Type; Federal / EPA Semi-Universal Type; 14 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.

Tube Material : Stainless Steel
No Returns Accepted - Catalytic Converter, CARB and Federal EPA Standards, 50-state Legal, Semi-Universal (Welding Required)
Walker®
No Returns Accepted - Catalytic Converter, CARB and Federal EPA Standards, 50-state Legal, Semi-Universal (Welding Required)
Part Number: WK80906
Guaranteed to Fit
$586.99
Vehicle Fitment
  • 1986 GMC C1500 Suburban High Sierra 8 Cyl 5.7L
  • 1986 GMC C1500 Suburban Base 8 Cyl 5.0L
  • 1986 GMC C1500 Suburban High Sierra 8 Cyl 5.0L
  • 1986 GMC C1500 Suburban Sierra Classic 8 Cyl 5.0L
  • 1986 GMC C1500 Suburban Sierra Classic 8 Cyl 5.7L
  • 1986 GMC C1500 Suburban Base 8 Cyl 5.7L
Product Details
Emissions : CARB and Federal EPA Standards, 50-state LegalNotes : 18 in. overall lengthType : Catalytic ConverterProduct Fit : Semi-Universal (Welding Required)Recommended Use : OE ReplacementQuantity Sold : Sold individuallyEO Number : D-182-55Gasket Included : Without GasketWarranty : 5-year or 50,000-mile Walker 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 : CalCat SeriesTube Material : Stainless Steel
Center Standard Series Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Walker®
Center Standard Series 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: WK15501
Guaranteed to Fit
$182.49
Vehicle Fitment
  • 1986 GMC C1500 Suburban Sierra Classic 8 Cyl 5.7L
  • 1986 GMC C1500 Suburban Base 8 Cyl 5.7L
  • 1986 GMC C1500 Suburban High Sierra 8 Cyl 5.0L
  • 1986 GMC C1500 Suburban Base 8 Cyl 5.0L
  • 1986 GMC C1500 Suburban Sierra Classic 8 Cyl 5.0L
  • 1986 GMC C1500 Suburban High Sierra 8 Cyl 5.7L
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 : 25.13 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 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 : Standard SeriesTube Material : Stainless Steel
Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
AP Exhaust®
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: APE645301
Guaranteed to Fit
$152.49
Vehicle Fitment
  • 1986 GMC C1500 Suburban High Sierra 8 Cyl 5.0L With Converter
  • 1986 GMC C1500 Suburban Sierra Classic 8 Cyl 5.0L With Converter
  • 1986 GMC C1500 Suburban High Sierra 8 Cyl 5.7L With Converter
  • 1986 GMC C1500 Suburban Sierra Classic 8 Cyl 5.7L With Converter
  • 1986 GMC C1500 Suburban Base 8 Cyl 5.7L With Converter
  • 1986 GMC C1500 Suburban Base 8 Cyl 5.0L With 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 : 24.75 in. Overall Length; 2.5 in. ID Pipe Inlet Type A; 2.5 in. OD Pipe Outlet Type ARestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyGasket Included : Without GasketOxygen Sensor Ports : Without sensor portOxygen 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.

Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Catco®
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: CAT2906
Guaranteed to Fit
$227.49
Vehicle Fitment
  • 1986 GMC C1500 Suburban High Sierra 8 Cyl 5.0L
  • 1986 GMC C1500 Suburban Sierra Classic 8 Cyl 5.0L
  • 1986 GMC C1500 Suburban High Sierra 8 Cyl 5.7L
  • 1986 GMC C1500 Suburban Sierra Classic 8 Cyl 5.7L
  • 1986 GMC C1500 Suburban Base 8 Cyl 5.7L
  • 1986 GMC C1500 Suburban Base 8 Cyl 5.0L
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)Product Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyWarranty : 5-year or 50,000-mile Catco 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.

Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
AP Exhaust®
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: APE609006
Guaranteed to Fit
$211.99
Vehicle Fitment
  • 1986 GMC C1500 Suburban High Sierra 8 Cyl 5.0L Pre-OBDII Unit
  • 1986 GMC C1500 Suburban Sierra Classic 8 Cyl 5.0L Pre-OBDII Unit
  • 1986 GMC C1500 Suburban High Sierra 8 Cyl 5.7L Pre-OBDII Unit
  • 1986 GMC C1500 Suburban Sierra Classic 8 Cyl 5.7L Pre-OBDII Unit
  • 1986 GMC C1500 Suburban Base 8 Cyl 5.7L Pre-OBDII Unit
  • 1986 GMC C1500 Suburban Base 8 Cyl 5.0L Pre-OBDII Unit
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)Product Fit : Direct FitRecommended Use : OE ReplacementWarranty : 5-year or 50,000-mile AP Exhaust limited warranty on converter body and 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.

Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Eastern®
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: EAST50010
Guaranteed to Fit
$140.99
Vehicle Fitment
  • 1986 GMC C1500 Suburban High Sierra 8 Cyl 5.0L RWD, Undercar
  • 1986 GMC C1500 Suburban Sierra Classic 8 Cyl 5.0L RWD, Undercar
  • 1986 GMC C1500 Suburban High Sierra 8 Cyl 5.7L RWD, Undercar
  • 1986 GMC C1500 Suburban Sierra Classic 8 Cyl 5.7L RWD, Undercar
  • 1986 GMC C1500 Suburban Base 8 Cyl 5.7L RWD, Undercar
  • 1986 GMC C1500 Suburban Base 8 Cyl 5.0L RWD, 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 : 24 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 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 : Aluminized 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)
Walker®
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: WK15042
Guaranteed to Fit
$140.49
Vehicle Fitment
  • 1986 GMC C1500 Suburban High Sierra 8 Cyl 5.0L With Air Tube on Catalyst
  • 1986 GMC C1500 Suburban Sierra Classic 8 Cyl 5.0L With Air Tube on Catalyst
  • 1986 GMC C1500 Suburban High Sierra 8 Cyl 5.7L With Air Tube on Catalyst
  • 1986 GMC C1500 Suburban Sierra Classic 8 Cyl 5.7L With Air Tube on Catalyst
  • 1986 GMC C1500 Suburban Base 8 Cyl 5.7L With Air Tube on Catalyst
  • 1986 GMC C1500 Suburban Base 8 Cyl 5.0L With Air Tube on Catalyst
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 : 18 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 : 25,000-mile Walker limited warranty on catalytic performance and 5-year or 50,000-mile structural integrity 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 : Standard 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), Universal
Davico®
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), Universal
Part Number: DAV633300
Universal Fit
$1,565.49
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 : UniversalRecommended Use : OE ReplacementQuantity Sold : Sold individuallyWarranty : 2-year or 25,000-mile Davico limited warranty on catalyst emission properties and 5-year or 50,000-mile limited warranty on tube, shell and weldsReturns 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.

No Returns Accepted -Catalytic Converter
Magnaflow®
No Returns Accepted -Catalytic Converter
Part Number: M6659959
Universal Fit
$161.00
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 : 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 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
No Returns Accepted -Catalytic Converter
Magnaflow®
No Returns Accepted -Catalytic Converter
Part Number: M6659956
Universal Fit
$161.00
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 : 2.5 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 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
No Returns Accepted -Catalytic Converter
Flowmaster®
No Returns Accepted -Catalytic Converter
Part Number: F132250220
Universal Fit
$77.49
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)Product Fit : UniversalRecommended Use : Performance ReplacementQuantity Sold : Sold individuallyOxygen Sensor Ports : Factory OEM PortsOxygen Sensor Port Location : Factory OEM LocationsWarranty : 5-Year Or 50,000-Mile Flowmaster Warranty On Exterior CasingsProp 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 3 | Showing 1 - 15 of 36 results

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P0430 Code: Catalyst System Efficiency Below Threshold (Bank 2)
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 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.
Can You Drive Without a Catalytic Converter?
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)
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)
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 Clogged
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