System: Fuel & Air Metering · Standard: SAE J2012 generic code · Severity: Low urgency
No immediate safety risk. Monitor it and fix it at the next service, but do not ignore it indefinitely.
Slow response is an ageing symptom rather than a hard failure, so it is easy to ignore too long.
Start by reading every stored and pending code, not just this one. A single fault frequently sets three or four codes at once, and the first one in the freeze-frame data is usually the cause while the rest are consequences.
The upstream oxygen sensor responds more slowly than the controller expects. O2 Sensor Circuit Slow Response (Bank 1 Sensor 1) is a generic fuel & air metering code defined by SAE J2012, so it carries the same meaning on every OBD-II vehicle.
Low urgency. No immediate safety risk. Monitor it and fix it at the next service, but do not ignore it indefinitely.
In rough order of how often they turn out to be the problem: Ageing oxygen sensor; Exhaust leak; Contamination from coolant or oil.
P0100 Mass Air Flow Circuit MalfunctionP0101 Mass Air Flow Circuit Range/PerformanceP0102 Mass Air Flow Circuit Low InputP0103 Mass Air Flow Circuit High InputP0106 Manifold Absolute Pressure Circuit Range/PerformanceP0110 Intake Air Temperature Circuit MalfunctionCode number, system and definition follow the SAE J2012 / ISO 15031-6 generic diagnostic trouble code standard. Symptoms, causes and severity are the standard generic diagnostic logic for that fault. This page does not contain manufacturer-specific procedures, part numbers or pricing.