Catalytic Converter18 31 7 786 347

BMW OE number, as listed in aftermarket supplier catalogues. Compare listings for this exact number, then confirm the part number and vehicle fitment before ordering.

Lowest aftermarket price

€73.19

plus €6.95 shipping to Germany, on AUTODOC

Compare 3 listings

Compare offers

What each marketplace’s search lists for this number, lowest price first, Ovoko last. Listings can include other parts that name it.

AUTODOCLowest price

1 listing

New

Checked 2026-05-15 13:53 UTCAftermarket parts whose suppliers list this OE number, not the original part.

€73.19Cheapest listing: HJS 91 12 1544+ €6.95 shipping to GermanyView on AUTODOC

Ovoko

2 listings

Used

Checked 2026-10-17 21:01 UTC

€120.00 – €260.33Cheapest listing: + €90.58 shipping to Germanyestimated delivery in 4–6 daysView on Ovoko

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Aftermarket part numbers

Supplier articles whose catalogue lists 18 31 7 786 347. Check the supplier’s own restrictions before ordering. A fitment condition under a part number is one its supplier names for at least one of the vehicles the part is listed for, not for all of them: a vehicle’s page shows which apply to it.

What these parts’ suppliers state

Each value belongs to the part number beside it, not to the OE number: parts that list one OE number can differ. Where your vehicle manufacturer gives a value, it takes precedence.

Specification	Value and the part numbers stating it
Fitting position	Front BOSAL 099-661, HELLA 8LE 366 050-251, HJS 91 12 1544, IMASAF 19.07.33, WALKER 20712, WALKER 28752

BOSAL: 099-661Supplementary Article/Supplementary Info 2: with attachment parts Emissions Standard: Euro 1 Emissions Standard: Euro 2Fitting position: FrontFitment conditions:Catalytic Converter Type: for vehicles with catalytic converter Construction Year to: 06.2001, 01.2002 Transmission Type: Manual Transmission
HELLA: 8LE 366 050-251Emissions Standard: Euro 3 Multi-piece: one-piece Supplementary Article/Supplementary Info 2: with attachment parts Quantity Unit: Kit
+1 moreShow fewer
Fitting position: FrontFitment conditions:Engine Code: M47D204D1 Construction Year to: 06.2001, 01.2002 Transmission Type: 5-Speed Manual Transmission
HJS: 90 12 5305Supplementary Article/Supplementary Info 2: with fastening material Guarantee: 3 years guarantee Exhaust System: without thread for oxygen sensorFitment conditions:Construction Year to: 08.2001, 01.2002 Engine Code: M47 D20 (204D1) Transmission Type: Manual Transmission91 12 1544Pipe Connector: Flexible Exhaust System: for catalytic converter for OE number: 18.31.2.247.656 for OE number: 18.30.4.710.746 for OE number: 18.30.7.790.298 for OE number: 18.30.7.786.714 for OE number: 18.30.7.787.586 for OE number: 18.30.7.792.160 for OE number: 18.30.2.247.656 for OE number: 18.31.7.786.347 Guarantee: 3 years guarantee Outer Diameter of Connection: 55 mm EU General Product Safety Regulation (GPSR): IEC 60417-6183 mechanical expertise required
+10 moreShow fewer
Fitting position: Front93 12 9305Supplementary Article/Supplementary Info: replaces primary and secondary catalytic converters Emissions Standard: Reaches pollutant group 4 after mounting = green label Emissions Standard: reaches particle reduction class PM2 when mountedFitment conditions:Construction Year to: 08.2001, 01.2002 Emission Key: 0430;0444, 0444 Engine Code: M47 D20 (204D1) Transmission Type: Manual Transmission
+1 moreShow fewer
96 12 3001Supplementary Article/Supplementary Info 2: with fastening material Exhaust System: without thread for oxygen sensor Guarantee: 4 years guarantee or up to 120,000 km not suited for fuel type: Bio Diesel not suited for fuel type: CNG/LPG Emissions Standard: Euro 2/Euro 3
+3 moreShow fewer
Fitment conditions:Construction Year to: 08.2001, 01.2002 Engine Code: M47 D20 (204D1) Transmission Type: Manual Transmission
IMASAF: 19.07.33Supplementary Article/Supplementary Info 2: with attachment parts Length: 1,050 mm Weight: 5.38 kgFitting position: Front
WALKER: 20712Emissions Standard: Euro 3 (D3) Supplementary Article/Supplementary Info 2: with attachment parts Guarantee: 3 years guarantee Length: 1,200 mm Weight: 4.8 kg Code Letter: 91
+3 moreShow fewer
Fitting position: FrontFitment conditions:Construction Year to: 06.2001, 01.2002 Engine Code: M47D204D1 Transmission Type: Manual Transmission28752Emissions Standard: Euro 4 (D4) Supplementary Article/Supplementary Info 2: with attachment parts Guarantee: 3 years guarantee Length: 980 mm Weight: 7.693 kg Code Letter: 92
+3 moreShow fewer
Fitting position: FrontFitment conditions:Engine Code: M47, M47 204 DI, M47 D20, M47D204D1, M47D204D4, M47D20TUUL, M47D20UL, M47ND204D4 Emissions Standard: Euro 3 (D3) for OE number: 18304710746, 18307789044/40 Construction Year to: 06.2001, 02.2007 Transmission Type: Automatic Transmission, Manual Transmission for manufacturer emissions standard: Euro 2005 Left-/right-hand drive vehicles: for left-hand drive vehicles Vehicle Equipment Line/Trim Level: M47D20UL Vehicle type: E46
+6 moreShow fewer
replaces WALKER 20711

Vehicle fitment

Engine code and production dates decide fitment. Model name and year alone don’t.

11 vehicles in 1 model series, inferred

Aftermarket parts that list 18 31 7 786 347 fit these vehicles according to their supplier catalogues. That does not prove 18 31 7 786 347 itself fits every one: check the engine code, production dates and the supplier’s restrictions on the model series’ vehicle pages.

BMW

1 model series · 11 vehicles

BMW model series inferred from aftermarket parts
Model series	Production	Engine codes	HSN / TSN
3 (E46)11 vehicles	02/1998 – 02/2007	M47, M47N	0005 / 624, 643, 659, 666, 720, 725, 726, 737, 738, 763, 765, 766, 767, 815, AEK, AEV