{
    "lazyNodes": false,
    "abFitnotesFlag": false,
    "abCrawlReviews": false,
    "productOptionsCookie": false,
    "orderDelayFlag": false,
    "skipSessionCookie": false,
    "covidMessage": false,
    "fullTitleCookie": false,
    "nrLoggerCookie": false,
    "checkoutReviewCookie": false,
    "productOptionSeqCookie": false,
    "maintenanceFlag": false,
    "bufferETACookie": false,
    "multiShippingDiscountFlag": false,
    "newFitmentFlag": false,
    "surveyOptInFlag": false,
    "crossSellFlag": false,
    "skuMappingFlag": false,
    "paySplitCookie": false,
    "callDisableFlag": false,
    "zipPaymentFlag": "u",
    "hassleFreeReturn": false,
    "lifetimeReplacement": false,
    "cpn_off": false
}
2001 BMW 325xi

2001 BMW 325xi Catalytic Converters

Refine by:

Shop Catalog

Showing 1 - 15 of 54 results
Display item:
15
30
45
Sort by:
Front Direct Replacement 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: JB960304
Guaranteed to Fit
$219.99
Vehicle Fitment
  • 2001 BMW 325xi Base 6 Cyl 2.5L Eng Des: M54, Wagon, AWD, Manifold Converter
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 : Manifold Converter; 33.5 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Manifold ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyEPA : N/TB6000/30407NNGasket 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 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 : 18256, 40815, 16503, 4386Series : Direct Replacement SeriesTube Material : Aluminized Steel
Rear Direct Replacement 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: JB960305
Guaranteed to Fit
$219.99
Vehicle Fitment
  • 2001 BMW 325xi Base 6 Cyl 2.5L Eng Des: M54, Wagon, AWD, Manifold Converter
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 : Manifold Converter; 23 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Manifold ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyEPA : N/TB6000/30407NNGasket 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 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 : 18257, 40816, 16504, 4387Series : Direct Replacement SeriesTube Material : Aluminized Steel
Front And Rear Catalytic Converters, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally Purchased In CA, CO, NY or ME), Manifold Converter
Part Number: SET-JB960304-2
Guaranteed to Fit
$594.99
Vehicle Fitment
  • 2001 BMW 325xi Base 6 Cyl 2.5L Eng Des: M54, Wagon, AWD, Manifold Converter
Product Details
Location : Front And RearEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Notes : Manifold ConverterComponents : (2) Manifold ConvertersRestricted States : California|Colorado|New York|MaineType : Manifold ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Set of 2EPA : N/TB6000/30407NNGasket 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 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 : 18256, 40815, 16503, 4386, 18257, 40816, 16504, 4387Series : Direct JC Whitney SeriesTube Material : Aluminized Steel
Front Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally Purchased In CA, CO, NY or ME), Manifold Converter, 33.5 In. Overall Length
Part Number: REPB960304
Guaranteed to Fit
$217.99
Vehicle Fitment
  • 2001 BMW 325xi Base 6 Cyl 2.5L
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 : Manifold Converter; 33.5 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Manifold ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyEPA : N/TB6000/30407NNGasket 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 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 : 40815Series : Direct Replacement SeriesTube Material : Aluminized Steel
Rear Direct Replacement 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: REPB960305
Guaranteed to Fit
$217.99
Vehicle Fitment
  • 2001 BMW 325xi Base 6 Cyl 2.5L
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 : Manifold Converter; 23 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Manifold ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyEPA : N/TB6000/30407NNGasket 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 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 : 40816Series : Direct Replacement SeriesTube Material : Aluminized Steel
Front And Rear Catalytic Converters, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally Purchased In CA, CO, NY or ME), Manifold Converter
Part Number: SET-REPB960304-2
Guaranteed to Fit
$413.99
Vehicle Fitment
  • 2001 BMW 325xi Base 6 Cyl 2.5L
Product Details
Location : Front And RearEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Notes : Manifold ConverterComponents : (2) Manifold ConvertersRestricted States : California|Colorado|New York|MaineType : Manifold ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Set of 2EPA : N/TB6000/30407NNGasket 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 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 : Direct Replacement SeriesTube Material : Aluminized Steel
Front Direct JC Whitney 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: KIT-J090716-06
Guaranteed to Fit
$318.99
Vehicle Fitment
  • 2001 BMW 325xi Base 6 Cyl 2.5L Eng Des: M54, Wagon, AWD, Manifold Converter
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 : Manifold Converter; 33.5 in. overall lengthComponents : (1) Front Manifold Catalytic Converter, (2) After Catalytic Converter Oxygen Sensors, (2) Before Catalytic Converter Oxygen SensorsRestricted States : California|Colorado|New York|MaineType : Manifold ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : KitEPA : N/TB6000/30407NNGasket 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 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.

Replaces OE Number : 11781433940Interchange Part Number : 18256, 40815, 16503, 4386, 25024611, 25024392, 11781433940Series : Direct JC Whitney SeriesTube Material : Aluminized Steel
Rear Direct JC Whitney 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: KIT-J090716-05
Guaranteed to Fit
$318.99
Vehicle Fitment
  • 2001 BMW 325xi Base 6 Cyl 2.5L Eng Des: M54, Wagon, AWD, Manifold Converter
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 : Manifold Converter; 23 in. overall lengthComponents : (1) Rear Manifold Catalytic Converter, (2) After Catalytic Converter Oxygen Sensors, (2) Before Catalytic Converter Oxygen SensorsRestricted States : California|Colorado|New York|MaineType : Manifold ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : KitEPA : N/TB6000/30407NNGasket 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 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.

Replaces OE Number : 11781433940Interchange Part Number : 18257, 40816, 16504, 4387, 25024611, 25024392, 11781433940Series : Direct JC Whitney SeriesTube Material : Aluminized Steel
Front and Rear Direct JC Whitney 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: KIT-J090716-07
Guaranteed to Fit
$527.99
Vehicle Fitment
  • 2001 BMW 325xi Base 6 Cyl 2.5L Eng Des: M54, Wagon, AWD, Manifold Converter
Product Details
Location : Front And RearEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Components : (1) Front Manifold Catalytic Converter, (1) Rear Manifold Catalytic Converter, (2) After Catalytic Converter Oxygen Sensors, (2) Before Catalytic Converter Oxygen SensorsRestricted States : California|Colorado|New York|MaineType : Manifold ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : KitEPA : N/TB6000/30407NNGasket 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 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.

Replaces OE Number : 11781433940Interchange Part Number : 18256, 40815, 16503, 4386, 18257, 40816, 16504, 4387, 25024611, 25024392, 11781433940Promotions : Free Oxygen Sensor with JCW Catalytic Converter KitsSeries : Direct JC Whitney SeriesTube Material : Aluminized Steel
Front and Rear Direct Replacement 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: KIT-090716-07
Guaranteed to Fit
$523.99
Vehicle Fitment
  • 2001 BMW 325xi Base 6 Cyl 2.5L Engine Designation: M54, Naturally Aspirated, GAS, Cyl 1-3 Or 4-6; Cyl 1-3; Cyl 4-6
Product Details
Location : Front And RearEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Components : (1) Front Manifold Catalytic Converter, (1) Rear Manifold Catalytic Converter, (2) After Catalytic Converter Oxygen Sensors, (2) Before Catalytic Converter Oxygen SensorsRestricted States : California|Colorado|New York|MaineType : Manifold ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : KitEPA : N/TB6000/30407NNGasket 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 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.

Replaces OE Number : 11781433940Interchange Part Number : 40815, 40816, 25024611, 25024392, 11781433940Series : Direct Replacement SeriesTube Material : Aluminized Steel
Rear Direct Replacement 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: KIT-090716-05
Guaranteed to Fit
$316.99
Vehicle Fitment
  • 2001 BMW 325xi Base 6 Cyl 2.5L Engine Designation: M54, Naturally Aspirated, GAS, Cyl 1-3 Or 4-6; Cyl 1-3; Cyl 4-6
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 : Manifold Converter; 23 in. overall lengthComponents : (1) Rear Manifold Catalytic Converter, (2) After Catalytic Converter Oxygen Sensors, (2) Before Catalytic Converter Oxygen SensorsRestricted States : California|Colorado|New York|MaineType : Manifold ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : KitEPA : N/TB6000/30407NNGasket 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 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.

Replaces OE Number : 11781433940Interchange Part Number : 40816, 25024611, 25024392, 11781433940Series : Direct Replacement SeriesTube Material : Aluminized Steel
Front Direct Replacement 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: KIT-090716-06
Guaranteed to Fit
$316.99
Vehicle Fitment
  • 2001 BMW 325xi Base 6 Cyl 2.5L Engine Designation: M54, Naturally Aspirated, GAS, Cyl 1-3 Or 4-6; Cyl 1-3; Cyl 4-6
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 : Manifold Converter; 33.5 in. overall lengthComponents : (1) Front Manifold Catalytic Converter, (2) After Catalytic Converter Oxygen Sensors, (2) Before Catalytic Converter Oxygen SensorsRestricted States : California|Colorado|New York|MaineType : Manifold ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : KitEPA : N/TB6000/30407NNGasket 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 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.

Replaces OE Number : 11781433940Interchange Part Number : 40815, 25024611, 25024392, 11781433940Series : Direct Replacement SeriesTube Material : Aluminized Steel
Rear Standard 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: DAV18257
Guaranteed to Fit
$423.99
Vehicle Fitment
  • 2001 BMW 325xi Base 6 Cyl 2.5L Eng Des: M54, Wagon, AWD, Manifold Converter
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 : 21.5 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 : REPB960305Series : Standard SeriesTube Material : Aluminized Steel
Rear Ultra Load 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: DAV48257
Guaranteed to Fit
$562.99
Vehicle Fitment
  • 2001 BMW 325xi Base 6 Cyl 2.5L Eng Des: M54, Wagon, AWD
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 : 21.5 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.

Series : Ultra Load SeriesTube Material : Aluminized Steel
Front Ultra Load 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: DAV48256
Guaranteed to Fit
$562.99
Vehicle Fitment
  • 2001 BMW 325xi Base 6 Cyl 2.5L Eng Des: M54, Wagon
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 : 29.5 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.

Series : Ultra Load SeriesTube Material : Aluminized Steel
Page 1 of 4 | Showing 1 - 15 of 54 results

Popular Products

Helpful Automotive Resources

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