There are 2 sensors.
A vehicle can have two to five oxygen sensors, sometimes even more.
4 sensors o2
A vehicle can have two to five lambda sensors, sometimes even more.
We currently have 11 oxygen sensor products to choose from for our 2011 GMC Acadia, and our stock prices range from just 51.99 to 191.99.
four oxygen sensors
The P2099 OBDII code is defined as a fuel rich trim system with a catalytic converter. The engine (PCM) monitors the amount of oxygen remaining in the exhaust gas stream after the catalytic converter. If too much oxygen is left, set code P2099.
If you choose to have it repaired, the cost of replacing the oxygen sensor itself can range from 20-94 USD depending on the brand and type of sensor. For a mechanic to repair, the price can range from 113 to $ 478 for parts and labor.
Lambda sensors are located in the exhaust gas stream, there is at least one lambda sensor in front of the catalyst and usually one in each exhaust manifold. Depending on the design of the exhaust system, one or two may be placed behind the catalytic converter to monitor efficiency.