P0471: Exhaust Pressure Sensor A Circuit Range/Performance
A generic powertrain (engine and transmission) trouble code, same meaning on every brand.
Yes with care - watch for power loss under load.
Symptoms
- Sluggish response
- Check engine light under heavy load
- Turbo behaving inconsistently on diesels
Likely causes, most common first
- Sensor line partially blocked
- Sensor drifting with age
- Exhaust restriction genuinely raising pressure
- Connector fault
Read P0471 yourself before paying for diagnosis
A basic Bluetooth OBD-II scanner ($20-40) plugs into the port under the dashboard and shows this code with live sensor data on your phone - useful both for confirming the fix and for talking to a shop from an informed position.
What is going on and how it gets diagnosed
P0471 says the back-pressure reading is implausible rather than absent - it does not track engine load the way physics demands. A half-blocked sensing line smooths and delays the reading exactly this way.
Before condemning the sensor, take its claim seriously once: compare the reading at idle to a warm rev. Idle back-pressure should be near zero and rise smartly with rpm. A reading that starts high and stays high may be telling the truth about a plugged catalytic converter or particulate filter - in which case the sensor is the only honest part in the exhaust and replacing it buries the message.
Repair options and cost
Typical US independent-shop ranges, parts and labor. Dealers run higher; regional labor rates vary.
Owner reports mentioning P0471
“P0471 error comes up off and on, this is recall related but the dealership refuses to address it. The seatbelt has to be clicked 2x in order to stick. Happens with driver side.”2021 Hyundai Sonata · Oct 2025
“My 2010 vw jetta tdi is throwing check engine light codes of p0472 and p0471. Both of these have to do with exhaust pressure sensors and I think this is an environmental issue and should be subject to a mandatory recall. The local vw dealership denies any recall would cover these cel codes.”2010 Volkswagen Jetta · Jan 2016 · 84,482 mi
Cars that report P0471 most often
Based on mentions of this code in NHTSA owner complaints.
Frequently asked questions
Can I drive with P0471?
Yes with care - watch for power loss under load.
How much does it cost to fix P0471?
Typical US repair costs range from $60 for the simplest fix (sensor hose cleaning or replacement) to $450 in the worst case. The right number depends on which cause your car has - see the causes list.
Related codes
The codes closest to P0471. They often appear together, and telling them apart is usually what narrows the diagnosis.
Definition per SAE J2012 standard nomenclature. Symptoms, causes and costs are editorial guidance - always confirm with a diagnosis of your specific vehicle.