P2209 trouble code from the oxygen sensors of the catalytic converter of car
P2209 CODE MEANING:
The P2209 trouble code means the on-board computer has detected a gaseous mixture outside of
normal parameters, based on input data from the oxygen sensors of the catalytic converter.
Oftentimes, there are no symptoms to accompany the P2209 code aside from the illumination of the
Check Engine Light on the dashboard. At times, however, there may be a no-start/engine stall condition.
If the catalytic converter is especially damaged, there may be hissing noises or engine hesitation when
attempting to accelerate.
1. Faulty Nitrogen Oxide (NOx) Sensor
2. Nitrogen Oxide (NOx) Sensor harness is open or shorted
3. Nitrogen Oxide (NOx) Sensor circuit poor electrical connection
The Nitrogen Oxide (NOx) sensor measures the amount of nitric oxide and nitrogen oxide in the exhaust
system. When the NOx sensor indicates that the storage capacity has been reached, the regeneration
phase is initiated by the fueling management system. The Power train Control Module (PCM) monitors
the NOx sensor and sets the code when the NOx sensor circuit voltage reading is not within the normal
operating threshold for a specific engine bank.
What repairs you can do to fix the P2209 code?
1. Repairing exhaust system leaks in hoses or connectors
2. Replacing the fuel pressure regulator or fuel injection component
3. Replacing the catalytic converter
4. Replacing the coolant temperature sensor
5. Replacing the manifold air pressure sensor
6. Replacing the mass air flow sensor
7. Replacing the oxygen sensor
NOTE: It is not advisable to ignore the issue or put off an inspection whether you can drive it or not.
When left unattended, a faulty catalytic converter or issues contributing to the problem can worsen and
affect other system parts. This translates into a need for more comprehensive and expensive repairs
Do you need more help with the P2209 code? Partsavatar, Canada is happy to connect you with a
qualified technician to troubleshoot your P2209 code or you can visit us and our certified mechanic will
diagnose and fix the code issue for you.