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1999 Ford Expedition
1999 Ford Expedition Catalytic Converters
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Part Number: REPF960311
Guaranteed to Fit
$260.99
Vehicle Fitment
- 1999 Ford Expedition Eddie Bauer 8 Cyl 5.4L Eng Vin: L, SOHC, 4WD
- 1999 Ford Expedition XLT 8 Cyl 5.4L Eng Vin: L, SOHC, 4WD
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 : 46 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyEPA : N/TB6000/31075NN, N/TB6000/63005NNGasket 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: REPF960312
Guaranteed to Fit
$264.99
Vehicle Fitment
- 1999 Ford Expedition Eddie Bauer 8 Cyl 5.4L Eng Vin: L, SOHC, 4WD, transmissionmfrcode : 4R100
- 1999 Ford Expedition XLT 8 Cyl 5.4L Eng Vin: L, SOHC, 4WD, transmissionmfrcode : 4R100
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 : 36.5 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyEPA : N/TB6000/31075NN, N/TB6000/69005NNGasket 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: SET-REPF960311
Guaranteed to Fit
$499.99
Vehicle Fitment
- 1999 Ford Expedition Eddie Bauer 8 Cyl 5.4L Eng Vin: L, SOHC, 4WD, transmissionmfrcode : 4R100
- 1999 Ford Expedition XLT 8 Cyl 5.4L Eng Vin: L, SOHC, 4WD, transmissionmfrcode : 4R100
Product Details
Location : Front, 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) Driver Side Catalytic Converter, (1) Passenger Side Catalytic ConverterRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Set of 2Gasket 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: M6651206
Guaranteed to Fit
$194.00
Vehicle Fitment
- 1999 Ford Expedition XLT 8 Cyl 4.6L Four Wheel Drive, Cutting And Welding Required
- 1999 Ford Expedition XLT 8 Cyl 5.4L Rear Wheel Drive, Cutting And Welding Required
- 1999 Ford Expedition Eddie Bauer 8 Cyl 4.6L Four Wheel Drive, Cutting And Welding Required
- 1999 Ford Expedition Eddie Bauer 8 Cyl 5.4L Rear Wheel Drive, 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 : 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: DAV15653
Guaranteed to Fit
$369.49
Vehicle Fitment
- 1999 Ford Expedition XLT 8 Cyl 4.6L 4WD
- 1999 Ford Expedition Eddie Bauer 8 Cyl 4.6L 4WD
Product Details
Location : Driver SideEmissions : 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 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: DAV15652
Guaranteed to Fit
$442.49
Vehicle Fitment
- 1999 Ford Expedition XLT 8 Cyl 4.6L 4WD
- 1999 Ford Expedition Eddie Bauer 8 Cyl 4.6L 4WD
Product Details
Location : 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 : 46 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: DAV19646
Guaranteed to Fit
$394.99
Vehicle Fitment
- 1999 Ford Expedition Eddie Bauer 8 Cyl 5.4L Eng Vin: L, SOHC, 4WD, transmissionmfrcode : 4R100
- 1999 Ford Expedition XLT 8 Cyl 5.4L Eng Vin: L, SOHC, 4WD, transmissionmfrcode : 4R100
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 : 45.25 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: DAV15646
Guaranteed to Fit
$431.99
Vehicle Fitment
- 1999 Ford Expedition Eddie Bauer 8 Cyl 5.4L Eng Vin: L, SOHC, 4WD
- 1999 Ford Expedition XLT 8 Cyl 5.4L Eng Vin: L, SOHC, 4WD
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 : 45.25 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: DAV121867
Guaranteed to Fit
$1,028.99
Vehicle Fitment
- 1999 Ford Expedition XLT 8 Cyl 4.6L 4WD, Efn: Xfmxa04.6Jgc; Emission Std: LEV1 LEV; Vehicle Class: Mdv3
- 1999 Ford Expedition Eddie Bauer 8 Cyl 4.6L 4WD, Efn: Xfmxa04.6Jgc; Emission Std: LEV1 LEV; Vehicle Class: Mdv3
Product Details
Location : Driver SideEmissions : CARB and Federal EPA Standards, 50-state LegalType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyEO Number : D-709Gasket Included : Without 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: DAV121866
Guaranteed to Fit
$1,086.99
Vehicle Fitment
- 1999 Ford Expedition XLT 8 Cyl 4.6L 4WD, Efn: Xfmxa04.6Jgc; Emission Std: LEV1 LEV; Vehicle Class: Mdv3
- 1999 Ford Expedition Eddie Bauer 8 Cyl 4.6L 4WD, Efn: Xfmxa04.6Jgc; Emission Std: LEV1 LEV; Vehicle Class: Mdv3
Product Details
Location : Passenger SideEmissions : CARB and Federal EPA Standards, 50-state LegalNotes : 24 in. W x 15.5 in. H; 46 in. overall lengthType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyEO Number : D-709Gasket Included : Without 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: DAV127790
Guaranteed to Fit
$1,168.49
Vehicle Fitment
- 1999 Ford Expedition XLT 8 Cyl 5.4L Eng Vin: L, SOHC, 4WD, transmissionmfrcode : 4R100, Efn: Xfmxa05.4Jgc; Emission Std: LEV1 LEV; Vehicle Class: Mdv3
- 1999 Ford Expedition Eddie Bauer 8 Cyl 5.4L Eng Vin: L, SOHC, 4WD, transmissionmfrcode : 4R100, Efn: Xfmxa05.4Jgc; Emission Std: LEV1 LEV; Vehicle Class: Mdv3
Product Details
Location : Driver SideEmissions : CARB and Federal EPA Standards, 50-state LegalNotes : 19 in. W x 9.75 in. H; 45.25 in. overall lengthType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyEO Number : D-709Gasket Included : Without 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: DAV123790
Guaranteed to Fit
$1,183.49
Vehicle Fitment
- 1999 Ford Expedition XLT 8 Cyl 5.4L Eng Vin: L, SOHC, 4WD, Efn: Xfmxa05.4Jgc; Emission Std: LEV1 LEV; Vehicle Class: Mdv3
- 1999 Ford Expedition Eddie Bauer 8 Cyl 5.4L Eng Vin: L, SOHC, 4WD, Efn: Xfmxa05.4Jgc; Emission Std: LEV1 LEV; Vehicle Class: Mdv3
Product Details
Location : Passenger SideEmissions : CARB and Federal EPA Standards, 50-state LegalNotes : 15.5 in. W x 10.5 in. H; 45.25 in. overall lengthType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyEO Number : D-709Gasket Included : Without 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: M6651356
Guaranteed to Fit
$202.00
Vehicle Fitment
- 1999 Ford Expedition XLT 8 Cyl 4.6L Rear Wheel Drive, Cutting And Welding Required
- 1999 Ford Expedition Eddie Bauer 8 Cyl 4.6L Rear Wheel Drive, 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 : "2.5 in. Inlet/Outlet; 15 in. overall length; 16 in. L x 6 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: M66447176
Guaranteed to Fit
$478.00
Vehicle Fitment
- 1999 Ford Expedition Eddie Bauer 8 Cyl 5.4L Rear Wheel Drive, EO# D-193-103; Eng Fam No: Xfmxa05.4Jgc; Cutting And Welding Required
- 1999 Ford Expedition XLT 8 Cyl 4.6L Rear Wheel Drive, EO# D-193-103; Eng Fam No: Xfmxa04.6Jgc; Cutting And Welding Required
- 1999 Ford Expedition XLT 8 Cyl 5.4L Rear Wheel Drive, EO# D-193-103; Eng Fam No: Xfmxa05.4Jgc; Cutting And Welding Required
- 1999 Ford Expedition Eddie Bauer 8 Cyl 4.6L Rear Wheel Drive, EO# D-193-103; Eng Fam No: Xfmxa04.6Jgc; Cutting And Welding Required
Product Details
Location : Front, Driver or Passenger SideEmissions : CARB and Federal EPA Standards, 50-state LegalNotes : 2.25 in. Inlet/Outlet; 11.5 in. overall lengthType : Catalytic ConverterProduct Fit : Semi-Universal (Welding Required)Recommended Use : OE ReplacementQuantity Sold : Sold individuallyEO Number : D-193-98, D-193-103Gasket Included : Without GasketWarranty : Magnaflow 5 year / 50,000 Mile 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: M6699356HM
Guaranteed to Fit
$188.00
Vehicle Fitment
- 1999 Ford Expedition Eddie Bauer 8 Cyl 4.6L Rear Wheel Drive, Cutting And Welding Required
- 1999 Ford Expedition XLT 8 Cyl 4.6L Rear Wheel Drive, 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 : 2.5 in. Inlet/Outlet; 15 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.
Page 1 of 6 | Showing 1 - 15 of 84 results
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Exact fit easy install with a buddy. I did it alone and it wasn’t pleasant but I got See More
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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) SEMI-UNIVERSAL (WELDING REQUIRED) MAGNAFLOW CATALYTIC CONVERTER
Meticulously constructed with premium stainless steel, MagnaFlow’s catal...
AP ExhaustCatalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Manufacturer #608705
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AP EXHAUST CATALYTIC CONVERTER
The AP Exhaust catalytic converter has an eco-friendly and energy-efficient design to support maximum pollution reduction. It is constructed with robust materials for long-lasting performance and is a direct-fit component to pe...
CatcoCatalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Manufacturer #2516
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CARB AND FEDERAL EPA STANDARDS, 50-STATE LEGAL DIRECT FIT CATCO CATALYTIC CONVERTER
If a clogged or damaged converter’s got your emissions system on the fritz, trust CATCO’s direct fit catalytic converters to deliver the right solution. They’re...
FlowmasterNo Returns Accepted -Catalytic ConverterManufacturer #2250220
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Flowmaster Catalytic Converter
Replace your old and worn-out catalytic converters with the help of Flowmaster. Flowmaster uses cutting-edge industrial design and manufacturing technique to produce a catalytic converter that meets or even exceeds the highest...
DavicoDriver Side Standard Series Catalytic Converter, 8, 4.6 4WD Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Manufacturer #15653
( Reviews) Questions, Answers
FEDERAL EPA STANDARD, 46-STATE LEGAL (CANNOT SHIP TO OR BE USED IN VEHICLES ORIGINALLY PURCHASED IN CA, CO, NY OR ME) DIRECT FIT DAVICO CATALYTIC CONVERTER
Carefully crafted to be easily installed without a need for cutting, sliding, clamping or welding, Davico&rsquo...Product Questions & Answers
Q:Hi,
Somebody stole my catalyst of my 2000 Ford E350 Super Duty XL V10.
How do I know if the new one requires a oxygen censor or not? Show Less
Oscar M.
A:BEST ANSWERHi Oscar, I'm pleased to assist you. This semi-universal catalytic converter fits the 2000 Ford E-350 Super Duty XL 10 Cyl 6.8L and does not have an oxygen sensor port. If interested, click on the link below to order at 5% off the regular price today while supplies last. I hope this is helpful. Enjoy shopping at Carparts.com!
https://www.carparts.com/catalytic-converter/magnaflow/m66447176?can=CPGG4850 Show less
Grace G.
2 Questions, 1 AnswerView all Q&As >
Q:Will it fit 2008 f150 4.6 xl 4x4?
Allen M.
A:BEST ANSWERHi Allen, thanks for initiating contact. No, this is only for the RWD (rear-wheel drive) on an 8 Cyl 4.6L engine. When it comes to catalytic converters, I suggest calling our parts specialists at 1-866-529-0412 for live agent assistance. Have a nice day! Show less
Grace G.
3 Questions, 1 AnswerView all Q&As >
Q:I have a 2020 mustang GT 5.0 premi coupe. Bought the car with missing cats does this item fit and does it take 2cats? Show Less
Richard N.
A:BEST ANSWERHi Richard, I'm pleased to assist you. No, this cat does not fit the 2020 Ford Mustang GT Premium 8 Cyl 5.0L. We currently only have the Federal emission direct fit driver-side cat compatible with the vehicle. Check the Vehicle Emission Control Information sticker, usually found underneath the hood, to see if it matches the emission control specifications. Federal emissions (46-state) stickers will simply say, "This vehicle conforms to U.S. EPA regulations," whereas California-emissions (50-state) vehicles will say, "This vehicle conforms to U.S. EPA and State of California regulations." If interested, use the link below to place an order while supplies last. Your order will come with a 30-day post-purchase price match guarantee. I hope this is helpful. Merry Christmas from CarParts.com!
https://www.carparts.com/details/Ford/Mustang/Dorman/Catalytic_Converter/2020/GT_Premium/8_Cyl_5-dot-0L/RB674499.html?can=CPGG4850_CSQA_20221223 Show less
Grace G.
5 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