A fault code doesn’t yet mean the unit or sensor itself is faulty: often it’s the plug and connector leading to it.
Possible causes
- The check (shut-off) valve is stuck or burnt
- Air passages in the cylinder head clogged with carbon
- The secondary air pump doesn’t run: seized from moisture or burnt out
- Secondary air hoses cracked or came off
What you can do yourself
- The pump runs only on a cold engine, for the first 1–2 minutes after starting: listen for it humming under the bonnet.
- It barely affects driving, but while warming up the exhaust is dirtier and the catalyst takes longer to heat up.
Find the part on Kaspi ShopBefore buying, check the part number or match the part by VIN in the Kaspi “Garage”.
The explanation comes from the error code reference in the AvtoElektrik PRO app.