P0470 to P0479: exhaust pressure sensor and exhaust pressure control valve
The sensor that measures pressure in the exhaust ahead of the turbocharger, or the valve that controls exhaust pressure, has a circuit fault or an implausible, low, high or intermittent reading.
SeverityModerateUsually not urgent today, but it can get worse if left.
Can you keep driving?Drive gently, check it soonWhat does P0470 mean?
Mostly on diesel engines, an exhaust back pressure sensor helps the computer control the turbocharger and the exhaust gas recirculation, and an exhaust pressure control valve, sometimes called an exhaust brake, can raise back pressure to warm the engine faster or slow the vehicle. The sensor's thin tube often clogs with soot or cracks from heat. When the readings cannot be trusted, the computer limits boost and recirculation, and power drops.
What causes P0470?
- A sensor tube clogged with soot or cracked by heat
- A failed exhaust pressure sensor or its wiring
- An exhaust pressure control valve stuck with soot
- A damaged connector near the hot exhaust
- A blocked particulate filter raising back pressure
What to check first for P0470
- Inspect the sensor's metal and rubber tubes for cracks and soot
- With the engine off, compare the exhaust pressure reading with barometric pressure
- Have the control valve commanded with a scan tool to check it moves freely
- Look for particulate filter or boost codes stored at the same time
Can you drive with P0470?
Usually you can drive to a workshop. Expect reduced power; if the engine smokes heavily or the particulate filter warning comes on as well, keep the trip short.
Since May 2018 an engine warning light that stays on is a major defect at the MOT, so the car fails until the fault is fixed.
Codes on this page
10
- P0470Exhaust Pressure Sensor
- P0471Exhaust Pressure Sensor Range/Performance
- P0472Exhaust Pressure Sensor Low
- P0473Exhaust Pressure Sensor High
- P0474Exhaust Pressure Sensor Intermittent
- P0475Exhaust Pressure Control Valve
- P0476Exhaust Pressure Control Valve Range/Performance
- P0477Exhaust Pressure Control Valve Low
- P0478Exhaust Pressure Control Valve High
- P0479Exhaust Pressure Control Valve Intermittent
Related codes
Checked on · Rafael Soares
These are the generic meanings every manufacturer shares. Each brand adds its own detail, so your car's handbook, its service information and a qualified mechanic have the last word. OdoKeep has no connection with any manufacturer, and the app does not read codes from the car.
