P0175 on Volvo
System Too Rich (Bank 2)
P0175 on Volvo vehicles indicates system too rich (bank 2). Au7o has documented this code across 1 Volvo model — most commonly on 850. P0175 is a generic OBD-II code meaning the engine computer detected that the air-fuel mixture on bank 2 is too rich, with too much fuel relative to air. The computer has had to remove fuel (negative fuel trim) to try to correct it but has reached its adjustment limit. Bank 2 is the cylinder bank that does not contain cylinder #1. A persistently rich mixture wastes fuel, causes rough running, and can overheat and damage the catalytic converter over time. Typical repair costs on Volvo range from $100 to $300, depending on the specific model and root cause.
Common Causes of P0175
- •Dirty or faulty mass air flow (MAF) sensor
- •Leaking or stuck-open fuel injector
- •Excessive fuel pressure / faulty fuel pressure regulator
- •Faulty or contaminated oxygen sensor
- •Engine vacuum leak or false air reading
- •Dirty/clogged air filter or restricted intake
- •Leaking fuel injector O-rings or fuel saturation
- •Faulty coolant temperature sensor skewing fuel trims
P0175 on Volvo by Model
Volvo 850(1 issue)
- Fuel Pressure Regulator Diaphragm Leak1993-1997
The fuel pressure regulator (FPR) on the 850 is mounted on the fuel rail and uses a rubber diaphragm to regulate fuel pressure. The diaphragm deteriorates with age and heat exposure, allowing raw fuel to leak into the vacuum line connected to the intake manifold. This causes rich running, hard starting (especially hot), poor fuel economy, and a strong fuel smell. It can also foul spark plugs.
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View P0175 across all makes →Frequently Asked Questions
What does P0175 mean on Volvo?▼
P0175 stands for "System Too Rich (Bank 2)." P0175 is a generic OBD-II code meaning the engine computer detected that the air-fuel mixture on bank 2 is too rich, with too much fuel relative to air. The computer has had to remove fuel (negative fuel trim) to try to correct it but has reached its adjustment limit. Bank 2 is the cylinder bank that does not contain cylinder #1. A persistently rich mixture wastes fuel, causes rough running, and can overheat and damage the catalytic converter over time. On Volvo specifically, this code is documented across 1 model.
What causes P0175 on Volvo vehicles?▼
Common causes on Volvo: Dirty or faulty mass air flow (MAF) sensor, Leaking or stuck-open fuel injector, Excessive fuel pressure / faulty fuel pressure regulator, Faulty or contaminated oxygen sensor, Engine vacuum leak or false air reading. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0175 on a Volvo?▼
Repair costs on Volvo range from $100 to $300, depending on the specific model and root cause.
Which Volvo models have P0175 documented?▼
Au7o has documented P0175 on 1 Volvo model: 850.