QUATTRO FRENI QF61F00070 WHEEL SPEED SENSOR (ABS)

The Quattro Freni QF61F00070 is a Rear Left ABS Wheel Speed Sensor for Mitsubishi Lancer (2009–2015), Lancer Ralliart (2009–2015), Outlander (2007–2015), and Outlander Sport (2011 first year). The sensor mounts on the rear-left knuckle and detects rotation of the toothed tone ring on the hub bearing, providing wheel-speed feedback to the ABS / ASC (Active Stability Control) module for anti-lock modulation, traction control, and stability intervention. Active magneto-resistive, 2-pin connector. Primary OEMs: Mitsubishi 4670A583 (current production primary) and 4670A157 (earlier / supersession). Aftermarket: Standard ALS1706, Holstein 5S11165.

The sensor is an active magneto-resistive (AMR) device. A magneto-resistive element biased by a magnet changes resistance as the magnetic field is modulated by the rotating tone ring. The on-sensor IC produces a square-wave digital current signal — frequency proportional to wheel speed. Unlike older passive sensors, the active design works at very low speeds (down to walking pace) and produces a clean digital signal immune to electromagnetic noise — essential for stability control and Hill Start Assist beyond just braking.

The sensor is powered by the ABS / ASC module via 2-pin connection. Active sensor diagnostics use voltage and signal frequency rather than resistance — an ohmmeter test will not produce a meaningful reading on this active sensor. Diagnostics require a scan tool reading live wheel-speed values, or an oscilloscope viewing the square-wave output.

The module compares all four wheel-speed signals continuously, modulating brake pressure at 4–15 cycles per second on the lockup-prone wheel. Beyond braking, the same signal feeds Mitsubishi’s Active Stability Control (ASC), Active Traction Control (ATC), EBD, and on Lancer Ralliart, the Active Center Differential (ACD) and Active Yaw Control (AYC) systems that distribute torque front / rear and across the rear axle. A failed sensor disables all of these.

Active Hall / magneto-resistive ABS wheel-speed sensors are typically classified under HS 8543.70 (electrical machines and apparatus, having individual functions, not specified or included elsewhere). Confirm the exact 10-digit subheading and applicable duty rates with your customs broker. Commercial invoice description: ABS wheel speed sensor for passenger vehicle, rear-left position, active magneto-resistive type.

Does NOT fit other wheel positions: Rear Right uses 4670A584 / 4670A158; Front Left uses 4670A575 / 4670A031; Front Right uses 4670A576 / 4670A032. Does NOT fit: pre-2007 Outlander — different platform and sensor; pre-2008 Lancer — previous-generation Lancer (CS) uses different sensor; Mitsubishi Eclipse — different platform and OEM (4670A359 / MN113198); 2012+ Outlander Sport may transition to a different sensor reference; 2016+ Outlander — current-generation platform with different sensor. Always confirm by the OEM number stamped on the existing sensor.

Difficulty: Easy. Estimated time: 30–45 minutes. No coding or calibration required after replacement — codes self-clear after the next ignition cycle if no fault is present. The sensor often seizes in the aluminium knuckle bore due to corrosion (very common on Outlander vehicles in salt-belt regions) — budget extra time for stuck-sensor extraction.

1. 1
   Park on level ground with parking brake applied. Loosen the rear-left wheel lug nuts one turn (21 mm socket). Jack at the manufacturer-specified rear lift point and support on jack stands rated for the vehicle weight. Remove the rear-left wheel.
2. 2
   Confirm fault with Mitsubishi MUT-III, FCAR FT800, or another Mitsubishi-capable scanner. Verify code C0045 and live wheel-speed reading absent during manual rotation. First check the rear-left wheel bearing — rock the wheel top / bottom; any movement indicates bearing replacement is needed before the sensor will work reliably (the integrated tone ring also lives in the bearing).
3. 3
   Locate the sensor on the rear-left trailing arm or knuckle. Single 10 mm bolt secures the sensor. Trace harness along the trailing arm to the chassis-side connector. Photograph routing before disassembly.
4. 4
   Apply penetrating oil to the bolt and sensor body perimeter where it sits in the aluminium knuckle bore. Corrosion between aluminium knuckle and steel sensor is very common in salt-belt regions. Allow 15–20 minutes penetration before removal.
5. 5
   Disconnect the chassis-side connector. Press the locking tab and pull straight off. Inspect pins for green / white oxide corrosion (very common on Mitsubishi from salt and water spray). Clean with electrical contact cleaner and a small brass wire brush. Water inside the connector indicates seal failure that will repeat the corrosion cycle.
6. 6
   Remove the 10 mm mounting bolt. If seized, apply additional penetrating oil and let it work in. For severely seized bolts, careful application of heat with a propane torch can help — keep heat away from the sensor body and harness. Do not break the bolt off — extraction from the aluminium knuckle is extremely difficult.
7. 7
   Extract the old sensor by pulling firmly along the mounting axis without side-to-side rocking (the side-to-side motion damages the bore). If seized, gentle wiggle while pulling. Do not pry on the body.
8. 8
   Clean the mounting bore with wire brush and brake cleaner. Remove rust scale, brake dust, corrosion. Inspect the tone ring on the hub bearing for missing teeth, cracks, or ferromagnetic brake-dust deposits. Damaged ring requires hub assembly replacement.
9. 9
   Install QF61F00070. Apply a thin coat of high-temperature anti-seize compound to the exterior of the sensor body to prevent future corrosion seizure (do NOT apply grease to the magnetic tip or the tone ring surface). Insert straight into the bore. Install the mounting bolt. Torque to 8–12 Nm (6–9 ft-lb). Do not overtighten — the sensor housing cracks easily.
10. 10
    Route the harness through original clips, no contact with hot exhaust or sharp edges, adequate slack for suspension travel. Apply dielectric grease generously to pins before reconnecting. Press until the locking tab clicks audibly.
11. 11
    Reinstall the wheel torquing lug nuts to 100–120 Nm (74–88 ft-lb) in a star pattern after lowering the vehicle to ground. Connect the diagnostic tool, clear all codes. Test drive at 30–50 km/h for 3–5 km — ABS / ASC warning lamps should extinguish automatically once the module confirms proper sensor operation. Test ABS by controlled hard braking on a low-traction surface to verify function restored.