The EGR control circuit is reading high — an electrical fault in the valve or its wiring rather than carbon clogging.
P0490 — also written PO49O, P 0490, 0490 — is the OBD-II code for exhaust gas recirculation 'a' control circuit high. Same code, same fix: this page covers every spelling of it.
P0490 is a emissions fault code, typically costing £120–£620 to put right in a UK garage.
What causes P0490?
- Failed EGR valve motor
- Short to voltage in the control wire
- Corroded EGR connector
- ECU driver fault
How P0490 is fixed
- Check the connector for corrosion and heat damage
- Test the valve motor resistance
- Replace the EGR valve
- Repair the loom
P0490 repair cost in the UK
Most P0490 repairs land between £120–£620 including parts and labour. The spread is wide because the cheap fix (a sensor, a hose, a leak) and the expensive fix (a major component) throw the same code — which is why a proper diagnosis before parts are bought saves the most money.
Can you drive with P0490?
Drivable, usually in limp mode with reduced power.
Urgency: medium.