A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
P0491 ← What does this code mean?11 Results
AUDI · 2026-07-23
Summary of all Vin-4-Pin topics for June Check engine light after charging - P0E5E00 Rattle noise from sound generator Vehicle sound malfunction warning Oil leak from oil filter drain off valve Secondary air codes P244000 or P049100 P04F000: EVAP system high pressure purge line performance
ASTON MARTIN · 2019-10-01
V12 Secondary air injection codes P0492 P0491
AUDI · 2017-04-20
This bulletin contains diagnosis and repair information for DTC P049100 and P049200.
VOLKSWAGEN · 2015-06-11
Technical Bulletin (Update Programming, DTCs P0491 and or P2440 stored in the ECM Fault Memory): Current ECM software are causing erroneous faults. This document contains the codes necessary to update the software to diagnose issues
AUDI · 2015-03-03
The MIL is on due to DTCs P0491 and P0492 being stored in the ECM.
AUDI · 2013-03-29
MIL on. DTC P0491 and P0492 (Secondary Air System Insufficient Flow, Bank 1/2) are stored at the same time. Mileage is greater than 15,000 miles. Under certain driving conditions, the secondary air ports in the cylinder head can accumulate carbon over time, causing a restriction.
AUDI · 2012-12-21
MIL on, A8 4.2 FSI, P0491 or P0492 secondary air system bank 1/2 Insufficient flow - Repair Authorization
AUDI · 2012-11-05
MIL on. DTC P0491 and P0492 (Secondary Air System Insufficient Flow, Bank 1/2) are stored at the same time.
AUDI · 2012-11-05
DTC P0491 and P0492 (Secondary Air System Insufficient Flow, Bank 1/2) are stored at the same time.
AUDI · 2012-11-05
Supersedes Technical Service Bulletin Group 26 number 12-10 dated March 30, 2012. MIL on. DTC P0491 and P0492 (Secondary Air System Insufficient Flow, Bank 1/2) are stored at the same time. Mileage greater than 20,000 miles.
PORSCHE · 2004-11-18
REPLACEMENT SHEETS (SUPPLEMENT) FOR OBD II MANUAL (OBD II) / DME 7.8: FAULT CODES P0410/P0491/P0492/P1411. *TT