Could be,Clogged or restricted PCV system,
Engine has blow-by from high mileage or poor maintenance.
Code P0660 on a Buick Enclave indicates a problem with the intake air heater circuit. To fix this issue, first, inspect the wiring and connectors associated with the intake air heater for any signs of damage or corrosion. Next, test the intake air heater relay and the heater element itself for functionality. If any components are faulty, replace them, clear the code, and retest to ensure the issue is resolved.
behind glove box
Its located in the air intake
The 1997 Buick LeSabre mass airflow sensor is located on the outside of the air intake housing. The sensor can be found on the right hand side of the air intake housing.
The mass airflow sensor and intake air temp. sensors are between air filter and throttle body
The 1998 Toyota Corolla air intake temperature sensor can be found on the air intake hose. The air intake hose will come from the air intake box and proceed to the engine.
The 1991 Buick IAT sensor can be found in the air intake hose. The IAT sensor will be between the air box and the top of the engine.
blower motor blows hot or cold air over evaporator
The IAT sensor is located on the intake manifold air cleaning housing or air duct.
The airbag module for a 2008 Buick Enclave is typically located under the center console or beneath the dashboard. It is connected to the vehicle's airbag system and may require professional installation or replacement due to its integration with the vehicle's safety systems. For precise location and replacement, it's advisable to consult the vehicle's service manual or a certified mechanic.
directly on top of the throttle body intake
The Intake Air Temperature (IAT) sensor on a Buick Rendezvous is typically located in the intake manifold or the air intake duct, depending on the engine configuration. It's often positioned near the air filter or mass air flow sensor. To access it, you may need to remove some components or covers, so it's advisable to consult the vehicle's service manual for specific instructions related to your model year.