LEMON Manuals
: Even more car manuals for everyone: 1960-2025
Home
>>
Chevrolet
>>
2006
>>
HHR LS, Standard
>>
Repair and Diagnosis
>>
Engine Performance
>>
System
>>
Engine Controls - 2.2L - DTC P0030 To P0135
>>
DTC P0121
>>
Conditions for Setting the DTC
April 5, 2026:
LEMON Manuals is launched!
Read the announcement.
Conditions for Setting the DTC
The ECM detects that the calculated airflow rate is more than expected.