P2098 on Subaru: Causes, Symptoms and Fix Cost
Quick Answer
Safe to drive (short-term)
P2098 on a Subaru means the engine computer has added fuel on bank 2 as far as it is allowed, but the oxygen sensor behind the catalytic converter on that bank still reads lean. Bank 2 only exists on engines with two banks of cylinders, such as V6, V8 and flat-six engines, and it is the side that does not hold cylinder 1. The usual causes are a tired rear oxygen sensor, a small exhaust leak ahead of it, or a lean mixture on that side. A four-cylinder inline engine has only bank 1 and cannot set this code.
- Severity
- Moderate · Emissions
- Typical repair cost, all makes
- €70-€1200
Connect a standard OBD2 adapter (Bluetooth LE on iPhone) to your Subaru and Skanyx tells you what P2098 means on that engine, whether it is safe to keep driving, and what the fix should cost. Free on iPhone and Android.
Get Skanyx freeWhat does P2098 mean on a Subaru?
The Quick Answer above is the generic definition. What follows is the model-specific detail for the Subaru models that log P2098.
Subaru Outback
2010-2019
The 3.6R versions of the Outback use the EZ36, a 3.6 litre flat-six with three cylinders in each of two opposed banks, so they can set bank 2 codes. The four-cylinder Outback engines are a different layout, so check the engine before applying a bank 2 diagnosis to a car.
Source: en.wikipedia.org
Sources
- en.wikipedia.org en.wikipedia.org/wiki/Subaru_EZ_engine
What causes P2098 on a Subaru?
Beyond the generic causes listed on the main P2098 page, these are the patterns noted for Subaru models:
Downstream oxygen sensor or exhaust leak on one bank of the flat-six
: Subaru Outback
How to diagnose P2098 on a Subaru with OBD2
- Confirm which side is bank 2 for your engine. Bank 1 is the side with cylinder 1, which differs between makes, so check the workshop data rather than guessing left or right.
- Read all stored codes and the freeze frame. Fix any bank 2 misfire, mixture or upstream sensor codes first, because they can set P2098 as a side effect. Check whether P2096 is also stored for bank 1.
- Look for an exhaust leak from the bank 2 manifold back to the rear sensor, with the engine cold. A black soot streak at a joint or a ticking that fades as the metal warms points to a leak.
- Watch the sensor readings on a scan tool if the car shows them. A healthy rear sensor holds a fairly steady voltage; one stuck low and lazy points at the sensor or a leak ahead of it.
- Compare the fuel trims of both banks at idle and at about 2,500 rpm. A positive trim on bank 2 only means a real lean condition on that side; trims near zero point to the rear sensor or an exhaust leak.
- Check for vacuum or intake leaks on that side, and for low fuel pressure or a weak injector.
- If the exhaust and mixture are good, replace the rear sensor on bank 2 with a correct-fit part, clear the code and drive a full cycle to confirm it does not return.
How much does P2098 cost to fix on a Subaru? (EUR)
Estimated repair costs for P2098 in EUR, compiled across makes. Expect Subaru parts and labour towards the upper end of each range.
| Repair | Parts Cost | Labor Cost | Total Estimate | DIY Difficulty |
|---|---|---|---|---|
| Replace downstream oxygen sensor, bank 2 sensor 2 | €50–€180 | €40–€120 | €90–€300 | Moderate |
| Repair exhaust leak (gasket, flex pipe or weld) | €20–€100 | €60–€200 | €80–€300 | Professional |
| Fix intake or vacuum leak (hose, intake gasket) | €15–€120 | €60–€300 | €75–€420 | Moderate |
| Repair sensor wiring or connector | €10–€40 | €60–€180 | €70–€220 | Moderate |
| Replace catalytic converter, bank 2 (aftermarket direct-fit) | €200–€900 | €100–€300 | €300–€1200 | Professional |
Prices estimated as of October 2026. Costs vary by region, vehicle, and shop.
Codes related to P2098
These codes are often seen alongside P2098 or point to related issues, on any make:
Looking for the full P2098 reference (all makes, full diagnosis flow, complete repair cost matrix)? See the main P2098 guide