If your Ford Transit 2.0T EcoBlue diesel triggers a check engine light, fails DPF regeneration, or drops into limp mode, a faulty particulate matter (PM) sensor is one of the most common root causes. The WJIECO LK21-5L216-BA particulate matter sensor is a direct OE replacement part, engineered to match OEM specifications for Ford Transit diesel vans equipped with EcoBlue 2.0T engines.
This PM soot sensor monitors exhaust soot concentration after the Diesel Particulate Filter (DPF). It sends accurate real-time particulate readings to the vehicle ECU, controls DPF active regeneration, keeps emissions compliant, and prevents expensive DPF damage. For fleet operators, repair garages and DIY diesel technicians, WJIECO LK21-5L216-BA offers a cost-effective, plug-and-play alternative to expensive OEM parts.
H2: Basic Specs & OEM Cross Reference
Brand: WJIECO Part Number: LK21-5L216-BA Alternate OE Number: 0281008347 Product Type: Diesel Exhaust Particulate Matter Sensor / PM Soot Sensor Fitment: Ford Transit 2.0T EcoBlue Diesel Installation Location: Exhaust, downstream of DPF filter Voltage: 12V automotive Connector: Direct plug-in, no wiring modification required Warranty: 12-month warranty
Cross-check your VIN and original part number before ordering. This sensor is model-specific and cannot be substituted with other PM sensor variants even if physical appearance looks similar.
H2: How The LK21-5L216-BA PM Sensor Works
The WJIECO LK21-5L216-BA particulate sensor uses precision electrode detection technology. Tiny soot particles from exhaust gas accumulate on the sensor’s probe electrodes. As soot levels change, the sensor measures resistance shifts and converts them into digital signals for the vehicle ECU.
The ECU uses this data for three critical jobs:
- Measure exhaust particulate concentration and verify DPF filtering efficiency
- Trigger active DPF regeneration at the correct time to burn trapped soot
- Activate MIL/check engine light and torque reduction when particulate levels exceed emission limits or sensor malfunction occurs
Without a working PM sensor, your van cannot properly manage the DPF system. Failed regeneration can clog the DPF permanently, and DPF replacement costs are far higher than replacing the PM sensor.
H2: Common Symptoms of a Bad LK21-5L216-BA Particulate Sensor
Watch for these warning signs that your Ford Transit needs a replacement PM sensor:
- Check Engine Light / MIL illuminated on dashboard
- OBD fault codes: P24AF, P24AE, P24B0, P24B1 (PM sensor circuit / performance codes)
- DPF regeneration fails, or regeneration runs too frequently
- Vehicle enters limp mode / reduced engine power
- Poor fuel economy, increased diesel consumption
- Failed state emissions / OBD inspection
- DPF warning light flashing intermittently
Important: Always run full diagnostics first. Confirm the fault code points to PM sensor failure and inspect wiring harness/connector corrosion before replacing the sensor. Do not replace the sensor if the DPF itself is damaged or blocked.
H2: Why Choose WJIECO LK21-5L216-BA PM Sensor?
WJIECO specializes in diesel exhaust aftertreatment sensors for light commercial and pickup diesel vehicles. Our LK21-5L216-BA particulate sensor is built for the harsh under-vehicle exhaust environment.
H3: OEM Matching Calibration & Build Quality
Every WJIECO LK21-5L216-BA PM sensor is factory-calibrated to match original OE signal output. The sensing probe, internal circuit board, wiring harness and sealed connector resist high exhaust heat, road salt, moisture and vibration common on commercial vans. No programming required after proper installation.
H3: Direct Plug-and-Play Fit
This is a bolt-on, plug-in replacement. The thread, mounting hole and electrical connector are identical to OEM LK21-5L216-BA. No cutting, splicing or custom wiring needed. Professional mechanics or experienced DIYers can complete installation in around 30–60 minutes.
H3: Cost Saving for Fleets & Repair Shops
Original OEM particulate sensors carry a high retail price. WJIECO LK21-5L216-BA delivers equivalent performance at a much lower price point, ideal for fleet maintenance shops and independent repair garages servicing multiple Ford Transit diesel vans. Bulk order discount available for commercial buyers.
H3: Quality Testing & Warranty
All WJIECO exhaust sensors go through strict end-of-line testing for signal stability, temperature cycling and electrical continuity. We back this LK21-5L216-BA particulate matter sensor with a 12-month limited warranty against manufacturing defects.
H2: Installation & Quick Tips
- Let the exhaust system cool completely before starting work. Hot exhaust parts cause severe burns.
- Locate the PM sensor mounted downstream of the DPF canister under the vehicle.
- Unplug the electrical connector carefully; inspect pins for corrosion, water damage or broken wires.
- Remove the old sensor with the correct socket. Clean exhaust threads before fitting the new WJIECO sensor.
- Hand-thread the new LK21-5L216-BA sensor, torque to manufacturer specification.
- Reconnect the plug, clear stored DTC fault codes with an OBD scan tool.
- Test drive and verify live PM readings, confirm no fault codes return and DPF regeneration works normally.
Note: After sensor replacement, some vehicles require a drive cycle to complete OBD readiness for emission testing.
H2: Frequently Asked Questions
H3: What vehicles fit WJIECO LK21-5L216-BA PM sensor?
This part fits Ford Transit 2.0T EcoBlue diesel models, matching OEM number LK21-5L216-BA / 0281008347. Always verify VIN and original part number on your sensor label before ordering.
H3: Can I clean my old PM sensor instead of replacing it?
In some cases, heavy soot contamination can be cleaned temporarily. However, once the internal sensing element is degraded or damaged, cleaning will not restore accurate readings. If P24AF / P24AE codes return after cleaning, replacement is required.
H3: Will replacing the PM sensor fix my DPF clog?
Only if the DPF itself is still functional. If your DPF is already blocked or damaged, replacing the PM sensor alone will not solve the DPF clog issue. Complete diagnostics are essential.
H3: Is programming needed after installing WJIECO LK21-5L216-BA?
No extra ECU programming is required for most Ford Transit 2.0T EcoBlue applications. Clear fault codes and perform a road test drive cycle.
H2: Order WJIECO LK21-5L216-BA Particulate Matter Sensor Today
Don’t let a faulty particulate sensor keep your Ford Transit off the road or trigger costly DPF damage. The WJIECO LK21-5L216-BA PM soot sensor is the reliable aftermarket replacement you need to restore DPF function, clear check engine codes, recover engine power and pass emissions tests.
Browse our full range of diesel exhaust sensors in the WJIECO online store, including NOx sensors, exhaust temperature sensors and other DPF aftertreatment parts. Contact our support team if you need fitment help or bulk pricing for repair shops and fleets.
