P0175 on a Volvo: Causes, Fixes & Repair Cost

🟠 Moderate severity · drivable

Drivable short-term, but a rich mixture can foul spark plugs and damage the catalytic converter if the code is ignored.

What P0175 means on a Volvo

On a Volvo, P0175 means the engine is running rich on bank 2. Volvo's inline-6 engines, like the ones in the XC90 and S80, split into two banks for fuel trim, so this code points to the rear half of the engine. The computer has cut fuel as far as it can and still sees a rich mixture.

Is P0175 common on Volvos?

P0175 is most common on Volvo 6-cylinder models like the XC90, XC60, and S80, since only 6-cylinder Volvos have a bank 2. Leaking fuel injectors and a dirty mass air flow sensor are the usual causes. A slow oxygen sensor can also keep the mixture rich on higher-mileage Volvos.

Commonly reported on: XC90, XC60, S80.

Symptoms

Check engine light is on
Poor fuel economy
Fuel smell from the exhaust
Rough idle or hesitation

Common causes

most common: Leaking fuel injector on the bank 2 side
common: Dirty or failing mass air flow (MAF) sensor
common: Slow or failing oxygen sensor on bank 2
less common: Fuel pressure too high
less common: Clogged air filter

How to fix it

Fix	DIY?	Typical cost
Clean the MAF sensor with MAF cleaner spray	Yes	$10–20
Replace the leaking injector on bank 2	Mechanic	$250–650
Replace the bank 2 upstream oxygen sensor	Yes	$80–250
Check fuel pressure and the regulator	Mechanic	$100–300

Frequently asked questions

Does a Volvo with an inline-6 engine have a bank 2?

Yes. Volvo splits the inline-6 into two banks for fuel trim, so P0175 points to the rear half of the engine.

What usually causes P0175 on a Volvo?

Leaking fuel injectors and a dirty MAF sensor are the most common causes. Both add too much fuel or read airflow too low, which makes the mixture rich.

Can I keep driving my Volvo with P0175?

Short trips are okay, but a rich mixture can foul plugs and damage the catalytic converter over time. Get it diagnosed soon.