49 Products
BM CATALYSTS Car Parts
BM Catalysts manufactures exhaust aftertreatment components for the independent aftermarket. The current AutoMotoPart range is centred on twelve BM31-series SCR catalytic converter references, with corresponding FK fitting kits and PP pressure-sensor pipes. Several systems use separate short and long pipes before and after the SCR or coated particulate-filter assembly, while fitting-kit suffixes distinguish hardware packages for different joints.
Begin with diagnosis, not replacement. An emissions warning, pressure-sensor fault or poor regeneration can originate in a blocked or split pressure pipe, damaged wiring, a sensor, dosing fault, exhaust leak, engine problem, particulate loading or the catalyst itself. The current AutoMotoPart selection contains 49 BM Catalysts items, led by 21 mounting kit, catalytic converter entries, 16 pressure pipe, pressure sensor (soot/particulate filter) entries, 12 scr catalytic converter entries. These BM Catalysts figures describe the range on this page rather than every product the brand may make elsewhere.
Confirm VIN-derived vehicle data, engine code, build period, emissions standard and the precise exhaust layout. Keep the complete BM Catalysts reference: BM31032H identifies a converter family, while PP31032A and PP31032B may represent different sides or lengths, and FK31032A or FK31032C are distinct fitting kits. Compare flanges, sensor ports, pipe routing, brackets and joint types on the vehicle. A matching numeric stem is useful evidence but does not make every suffix interchangeable or prove all required hardware is included.
Exhaust systems become extremely hot and may contain sharp, heavy components. Allow cooling, support the vehicle and exhaust safely, and follow current repair and diagnostic information. Resolve upstream causes before fitting a replacement; contamination, over-dosing, leaks or an engine fault can damage a new unit. Use new seals and fasteners where specified, align the complete system before final tightening and route pressure pipes away from heat and abrasion. After assembly, check leaks, live sensor data and required service procedures without bypassing emissions controls. The range below is reference-led; final compatibility depends on the exact vehicle and system.
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BM Catalysts: understand the range before choosing
BM Catalysts is a UK aftermarket exhaust manufacturer whose official portfolio includes catalytic converters, diesel particulate filters and selective catalytic reduction products. This page represents a highly focused part of that portfolio: 12 SCR catalytic converters are paired with 16 particulate-filter pressure pipes and 21 converter fitting kits. The shared numeric stems show related families, but A, B, C, FK, PP and BM suffixes identify different components and positions.
AutoMotoPart currently lists 49 BM Catalysts items. The largest BM Catalysts groups are 21 mounting kit, catalytic converter entries, 16 pressure pipe, pressure sensor (soot/particulate filter) entries, 12 scr catalytic converter entries. BM Catalysts totals can change, so a category count is orientation rather than proof that a particular reference suits a vehicle, workplace or job. The exact BM Catalysts listing, its current technical information and the item in front of you must agree.
What the BM Catalysts page actually covers
| Product group in this range | Current entries | Selection focus |
|---|---|---|
| Mounting Kit, catalytic converter | 21 | Match the exact BM converter, joint, gasket, clamp and fastener suffix; a fitting kit is not universal hardware. |
| Pressure Pipe, pressure sensor (soot/particulate filter) | 16 | Confirm before/after position, short or long form, connection ends, routing and the paired BM converter reference. |
| SCR Catalytic Converter | 12 | Verify complete SCR unit, engine, build period, emissions layout, ports, brackets and legally required configuration. |
Mounting kits are the largest group at 21 entries, followed by 16 pressure pipes and 12 SCR units. References cluster around BM31021H, 31030H, 31031H, 31032H, 31034H, 31037H through 31042H and 31129H. Many families include two pressure pipes and two fitting-kit variants. That regularity makes an exact suffix especially important: the catalogue structure is relational, not a set of generic replacements.
Build a reliable shortlist
Aftertreatment systems combine exhaust hardware, pressure and temperature sensing, DEF dosing, engine management and software diagnostics. Record the fault codes and live values before dismantling. Confirm whether the code describes an electrical circuit, implausible pressure, efficiency, dosing or temperature condition; similar warning lamps do not identify the same failed component.
| Check | Why it matters | Useful evidence |
|---|---|---|
| Vehicle identity | Engine and emissions layouts can change within one model and Euro stage | VIN, engine code, build period and current application record |
| System position | Before and after pipes or sensors are not interchangeable | Exhaust diagram, hose routing and complete PP suffix |
| Converter reference | Related pressure pipes and kits are tied to specific BM units | Full BM number including final letter, not numeric stem alone |
| Physical interfaces | Flanges, ports, brackets, pipe ends and lengths determine installation | Undamaged original layout and published product drawing |
| Fault evidence | Pressure, dosing, leakage, engine and sensor faults can mimic catalyst failure | Codes, live data, smoke or leak tests and technical procedure |
| Required contents | Gaskets, clamps, nuts and brackets vary by joint and kit suffix | Exact kit listing plus vehicle single-use hardware requirements |
Do not clear fault codes and order the first component named in a description. Preserve freeze-frame and live data, inspect pipes and electrical connections, and confirm the exhaust is mechanically sound. If the BM reference and the vehicle layout disagree, resolve the identification rather than cutting or welding a new unit to resemble the old one.
SCR operation and failures outside the catalyst
Selective catalytic reduction uses diesel exhaust fluid dosing and a catalyst to reduce nitrogen oxides. The complete system relies on correct fluid quality, injector operation, exhaust temperature, sensors and control strategy. Crystallised deposits, an injector that leaks or under-doses, contaminated fluid, temperature faults and upstream engine problems can all impair operation without the SCR substrate being the first fault.
Check service information for commanded dosing, temperature plausibility and post-repair procedures. Do not add unofficial chemicals, wash a substrate or alter software to suppress a warning. A no-start countdown or emissions limitation should be diagnosed from the system evidence. Replacing a BM Catalysts unit before correcting over-dosing or combustion problems can expose the new component to the same cause.
Pressure pipes, before-and-after positions and live data
The PP references connect exhaust pressure points to a sensor used around a particulate filter or SCR-coated filter. Short A and long B wording appears in the evidence for several paired systems, including positions before and after the assembly. Confirm each port from the diagram; crossing hoses can invert or corrupt the differential-pressure signal even when the connectors fit.
Inspect pipes for splits, heat damage, blockage, condensation, soot at joints and chafing. Check the sensor's electrical supply, signal and hose ports before condemning it. With the exact procedure, compare pressure at key engine conditions and assess whether values return plausibly when off. Never probe or drill a pipe in a way that leaves debris to enter the sensor or exhaust. Route replacements in every original clip with heat clearance.
Fitting kits, seals and exhaust alignment
BM fitting-kit references beginning FK may contain different gaskets, clamps, nuts or joint hardware under A and C suffixes. Check the individual contents against the converter ends and the rest of the exhaust. Retain old parts only for identification; crushed gaskets, distorted clamps and heat-cycled locking fasteners should be renewed where the fitting instructions require it.
Clean mating faces without gouging them and remove old gasket material. Offer the converter and supports loosely so the assembly can find its natural position, then tighten in the stated sequence. Pulling a misaligned exhaust together with flange bolts can preload welds, brackets and flexible sections, leading to leakage or fracture. Inspect engine and gearbox mounts if movement has strained the previous system.
Removing and installing an SCR converter
Allow the exhaust to cool fully, isolate electrical connectors as specified and support heavy sections before removing clamps or brackets. Penetrating fluid and heat around fasteners introduce fire and exposure risks; choose a controlled method and protect fuel, brake and DEF lines. Mark sensors and pipes by position rather than letting similar connectors hang together.
Compare the new BM Catalysts unit before installation: body direction, inlet and outlet, bracket location, sensor ports, flanges and shields must agree. Transfer only components permitted by the instructions and apply no unspecified sealant to sensor threads or gasket faces. After alignment, verify clearance to underbody, driveshafts, heat shields, wiring and hoses throughout the normal movement envelope.
Leak checks, diagnostics and lawful return to service
An exhaust leak upstream of a pressure or gas sensor can distort diagnosis and release hot gases. Test joints by an approved method with ventilation, avoiding contact with hot or moving parts. Inspect all pressure-pipe connections and wiring. Clear codes only when the repair procedure reaches that stage, then observe live pressure, temperature and dosing information through the required drive or stationary checks.
Do not remove, hollow, bypass or electronically disable required emissions equipment. If a warning or implausible reading returns, retain the post-repair data and investigate rather than repeatedly regenerating or replacing parts. Check oil, coolant and fuel-system conditions that can load the aftertreatment system, and confirm any adaptation or learned-value reset required for the exact vehicle.
From identification to a checked result
| Stage | Good practice for this range | Mistake to avoid |
|---|---|---|
| Diagnose | Capture codes, live data, leaks, sensor and dosing evidence | Treating the component named in a fault description as proven failed |
| Identify | Match vehicle, engine, system position and complete BM, PP and FK references | Using the shared numeric stem while ignoring A, B, C or H |
| Prepare | Cool and support the exhaust, obtain fitting contents and mark connections | Cutting parts out before confirming orientation and replacement contents |
| Install | Clean faces, align loosely, route pipes and tighten in sequence | Pulling a strained system together with flange fasteners |
| Verify | Check leaks, clearances, live data and required service procedures | Bypassing a warning or returning the vehicle without causal checks |
Record the installed BM Catalysts H reference, every PP and FK suffix used, diagnostic readings and any reset or test completed. That record helps distinguish a renewed hardware fault from an unresolved dosing, sensor, engine or software condition.
Reading real BM Catalysts references
The BM Catalysts names below are examples from the current range and show why the complete description matters. They are not universal BM Catalysts recommendations and should not be treated as a fitment list. Within BM Catalysts, a shared family word can conceal a different dimension, connector, material, pack format, operating condition or installation side.
| Example listing | What to verify beyond the name |
|---|---|
| BM Catalysts FK31031A Mounting Kit, catalytic converter | Full BM, PP or FK suffix, paired converter and position before or after |
| BM Catalysts FK31034A Mounting Kit, catalytic converter | Engine code, build period, emissions standard and exhaust-system layout |
| BM Catalysts FK31039A Mounting Kit, catalytic converter | Flanges, ports, brackets, pipe length, routing and package contents |
| BM Catalysts FK31040C Mounting Kit, catalytic converter | Diagnostic evidence, upstream cause, alignment and post-fit live data |
| BM Catalysts FK31041A Mounting Kit, catalytic converter | Full BM, PP or FK suffix, paired converter and position before or after |
| BM Catalysts FK31042A Mounting Kit, catalytic converter | Engine code, build period, emissions standard and exhaust-system layout |
| BM Catalysts PP31021B Pressure Pipe, pressure sensor (soot/particulate filter) | Flanges, ports, brackets, pipe length, routing and package contents |
| BM Catalysts PP31034B Pressure Pipe, pressure sensor (soot/particulate filter) | Diagnostic evidence, upstream cause, alignment and post-fit live data |
The sample list shows converter families accompanied by A and B pressure pipes and A or C fitting kits. These codes describe cooperating components, not alternatives. Keep each complete BM Catalysts reference assigned to its exact position until the system has passed leak and diagnostic checks.
Common errors around BM Catalysts products
- Replacing a BM Catalysts SCR unit from a warning lamp without system diagnosis.
- Swapping before- and after-filter pressure pipes because their ends appear similar.
- Ignoring the final A, B, C or H suffix on a related reference family.
- Reusing crushed gaskets or unsuitable heat-cycled fasteners.
- Tightening a misaligned exhaust until brackets and flexible joints are stressed.
- Routing a pressure pipe against hot metal, sharp edges or moving parts.
- Leaving an injector, engine or sensor fault that can damage a replacement unit.
- Removing or disabling required emissions-control equipment.
BM Catalysts questions and answers
Q: What BM Catalysts products are on this page?
A: The range contains SCR catalytic converters, particulate-filter pressure pipes and reference-related fitting kits.
Q: Does an SCR fault code prove the catalyst has failed?
A: No. Dosing, sensors, pressure pipes, leaks, temperature and engine faults can produce related symptoms.
Q: What do PP references identify?
A: They identify pressure pipes for specified sensor positions and converter families; complete A or B suffixes matter.
Q: Can the two pressure pipes be swapped?
A: No. Confirm before or after position, length, routing and exact paired reference.
Q: Are FK fitting kits universal?
A: No. Match the complete kit suffix and contents to the exact converter and joint.
Q: Should old gaskets be reused?
A: Renew seals and single-use fittings where the BM and vehicle instructions require them.
Q: Why must the exhaust be aligned before tightening?
A: A strained assembly can leak, transmit vibration or crack brackets and welds.
Q: Can an SCR converter be cleaned with a chemical?
A: Do not apply an unofficial cleaning method; diagnose deposits and follow the exact technical repair process.
Q: What causes DEF crystallisation?
A: Dosing, temperature and injector or line faults can contribute, so the system cause must be investigated.
Q: Can emissions equipment be bypassed after a fault?
A: No. Required equipment must remain present and functional, with the underlying fault repaired.
Q: What should be checked after installation?
A: Inspect leaks, clearances, pressure-pipe routing, wiring, live data and any required adaptation or test.
Q: What BM information should be recorded?
A: Keep the full converter, pressure-pipe and fitting-kit suffixes plus diagnostic readings and repair outcome.