A system, comprising: a processor; and a memory communicatively coupled to the processor and storing instructions that, when executed by the processor, perform operations, comprising: receiving an ambient air temperature sensor reading from an ambient air temperature sensor (110, 215) associated with a vehicle; determining, from a first model, a first ambient air temperature estimate, the first model including a temperature of air at a pre-compressor sensor prior to the air entering a compressor associated with the vehicle; determining from a second model, a second ambient air temperature estimate, the second model being based at least on a temperature drop of air as the air passes through an intercooler (155, 260) associated with the vehicle; comparing the first ambient air temperature estimate to the ambient air temperature sensor reading to determine: whether the ambient air temperature sensor reading is lower than the first ambient air temperature estimate; or whether the ambient air temperature sensor reading is higher than the first ambient air temperature estimate; and determining a state of an air diverter valve associated with the vehicle based, at least in part, on: the comparison between the ambient air temperature sensor reading and the first ambient air temperature estimate; and the second ambient air temperature estimate. a processor; and a memory communicatively coupled to the processor and storing instructions that, when executed by the processor, perform operations, comprising: receiving an ambient air temperature sensor reading from an ambient air temperature sensor (110, 215) associated with a vehicle; determining, from a first model, a first ambient air temperature estimate, the first model including a temperature of air at a pre-compressor sensor prior to the air entering a compressor associated with the vehicle; determining from a second model, a second ambient air temperature estimate, the second model being based at least on a temperature drop of air as the air passes through an intercooler (155, 260) associated with the vehicle; comparing the first ambient air temperature estimate to the ambient air temperature sensor reading to determine: whether the ambient air temperature sensor reading is lower than the first ambient air temperature estimate; or whether the ambient air temperature sensor reading is higher than the first ambient air temperature estimate; and determining a state of an air diverter valve associated with the vehicle based, at least in part, on: the comparison between the ambient air temperature sensor reading and the first ambient air temperature estimate; and the second ambient air temperature estimate. receiving an ambient air temperature sensor reading from an ambient air temperature sensor (110, 215) associated with a vehicle; determining, from a first model, a first ambient air temperature estimate, the first model including a temperature of air at a pre-compressor sensor prior to the air entering a compressor associated with the vehicle; determining from a second model, a second ambient air temperature estimate, the second model being based at least on a temperature drop of air as the air passes through an intercooler (155, 260) associated with the vehicle; comparing the first ambient air temperature estimate to the ambient air temperature sensor reading to determine: whether the ambient air temperature sensor reading is lower than the first ambient air temperature estimate; or whether the ambient air temperature sensor reading is higher than the first ambient air temperature estimate; and whether the ambient air temperature sensor reading is lower than the first ambient air temperature estimate; or whether the ambient air temperature sensor reading is higher than the first ambient air temperature estimate; and determining a state of an air diverter valve associated with the vehicle based, at least in part, on: the comparison between the ambient air temperature sensor reading and the first ambient air temperature estimate; and the second ambient air temperature estimate. the comparison between the ambient air temperature sensor reading and the first ambient air temperature estimate; and the second ambient air temperature estimate.