Kubota WG1605, WG1903, WG2503 & WG3800 Oxygen (O2) Sensor | Genuine Kubota EG523-12240
This is a new, genuine Kubota oxygen sensor, part number EG523-12240. It fits Kubota WG series spark-ignition engines, which run on gasoline or LPG: the WG1605, WG1903, WG2503 and WG3800. It cross-references to Bosch 0258006956.
The engine controller uses the O2 signal to trim fuel. A slow or dead sensor sets O2 fault codes and can cause rich or lean running, rough idle, high fuel use and fouled plugs. Fix exhaust leaks ahead of the sensor first, since they give false lean readings.
Confirm Fitment Before You Order
Kubota WG engines come in gasoline and LPG builds. Send the engine model and serial number from the engine tag, plus the fault code if you have one, and we will confirm the sensor. Call 530-668-0818 and we will confirm the exact match at no charge before anything ships.
Specifications
| Part number | EG523-12240 |
| Brand | Kubota |
| Condition | New, genuine, in original packaging |
| Warranty | Kubota genuine parts warranty: 1 year against defects in materials or workmanship. |
| Type | Exhaust oxygen (O2) sensor |
| Engines | Kubota WG1605, WG1903, WG2503, WG3800 |
| Bosch cross-reference | 0258006956 |
| Shipping weight | 1 lb |
Fits / Applications
- Kubota WG1605 engine
- Kubota WG1903 engine
- Kubota WG2503 engine
- Kubota WG3800 engine
Keep anti-seize and sealants off the sensor tip. Route the lead away from hot exhaust parts, clear codes after installing, and confirm the signal switches at operating temperature.
Part Numbers & Cross Reference
Bosch 0258006956
Cross-reference numbers can change with engine serial, build year and emissions tier, so treat this list as a starting point. Send us your engine serial number and we will confirm the exact match against your build before anything ships. That check is free and takes a few minutes.
Frequently Asked Questions
Which Kubota engines take the EG523-12240 oxygen sensor?
It fits Kubota WG series spark-ignition engines, which run on gasoline or LPG: the WG1605, WG1903, WG2503 and WG3800.
What Bosch number does EG523-12240 cross to?
It cross-references to Bosch 0258006956. This listing is the new, genuine Kubota sensor, sold outright with no core charge.
Will a new O2 sensor fix a lean code on my WG engine?
Not if there is an exhaust leak ahead of the sensor, since leaks give false lean readings. Fix those first. A slow or dead sensor sets O2 fault codes and can cause rich or lean running, rough idle, high fuel use and fouled plugs.
How do I confirm EG523-12240 for a gasoline or LPG WG engine?
Kubota WG engines come in gasoline and LPG builds. Call 530-668-0818 with the engine model and serial number from the engine tag, plus the fault code if you have one, and we will confirm the sensor at no charge.
Related Parts
- Kubota WG1605, WG2503 & WG3800 Engine Ignition Coil | Genuine Kubota EG523-67090
- Kubota WG1605 4-Cylinder Engine Exhaust Manifold | Genuine Kubota EG522-12313
- Kubota WG2503 Gasoline/LPG Industrial Engine Electric Fuel Pump | Genuine Kubota EG522-52020
Why Buy From Valley Fuel Injection
We are an authorized Kubota dealer and a diesel fuel-injection shop in Woodland, CA, working on diesel engines since 1993. When you call, you talk to people who know Kubota engines and can help you match the part number to your engine serial or machine model before you order. See our Kubota engine sales, parts and service.
UPS Ground anywhere in the lower 48. Questions on fitment? Call 530-668-0818.
Pricing covers the unit itself. Any applicable sales tax is additional; shipping is calculated at checkout. Buying tax-exempt? Qualifying diesel repair shops, fleets, farms, and agricultural operations can purchase tax-free. Set up tax-exempt purchasing once and every qualifying order is tax-free going forward.
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