The Lemon IndexThe relay or circuit that runs the secondary air pump has a fault.
Drive on, get it checked. You can usually keep driving. Have the code read at your next service or within a few weeks.
Failed relay. Then: wiring fault.
Owners named P0418 in 15 complaints to the U.S. government, most often on the Toyota Tundra.
Cars owners report it on
Complaints that name P0418, by model. Raw counts, not a failure rate: popular models get more complaints.
Years owners report it on most: 2012 Toyota Tundra
The details
What P0418 means
The relay or circuit that runs the secondary air pump has a fault.
Can I drive with P0418?
Drive on, get it checked. You can usually keep driving. Have the code read at your next service or within a few weeks.
33% of the owner complaints that name P0418 also say the car loses power or goes into limp mode. A complaint can describe more than one problem, so this doesn't prove the code caused it.
Common causes of P0418
- Failed relay
- Wiring fault
A shop should confirm the cause with a scan and tests before replacing parts.
What owners describe
- Loses power or goes into limp mode: 33% of complaints
- Stalls or shuts off: 13% of complaints
Share of complaints naming the code whose text also mentions each problem.
Model years that report P0418 most
2012 Toyota Tundra (6).
Related codes
P0411 P0410 P0420 P0421 P0406 P0405 P0404 P0403
Quick answers
What does P0418 mean?
Secondary Air Injection System Control A Circuit. The relay or circuit that runs the secondary air pump has a fault.
Can I drive with P0418?
Drive on, get it checked. You can usually keep driving. Have the code read at your next service or within a few weeks.
What causes P0418?
Failed relay; Wiring fault.
Counts: NHTSA owner complaints whose text names P0418. A complaint is an owner's report, not a diagnosis. Meanings: the standard SAE J2012 definitions in our own words; manufacturer codes only where verified for that make. General information, not repair advice for your car.