Under back seat.
it has 250 horsepower
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under the steering wheel on the left side
On my 99 SSEi, it was located on the passenger side just in front of the rear wheel.
With a Hammer
http://www.modifiedlife.com/1993-pontiac-bonneville-car-stereo-wiring-schematic/
The wheel bolt pattern is 5x115
The 1994 SSEI is on the overhead counsel.
To jump-start a 2001 Pontiac Bonneville SSEi, first ensure both vehicles are turned off. Connect the red jumper cable to the positive terminal of the dead battery, then attach the other end to the positive terminal of the working battery. Next, connect the black jumper cable to the negative terminal of the working battery and attach the other end to an unpainted metal surface on the dead car, away from the battery. Start the working vehicle, let it run for a few minutes, then attempt to start the Bonneville.
There are two oxygen sensors, there is one located in the exhaust system before the catalytic converter and one after the catalytic converter.
On the Pontiac Bonneville, "SSEi" stands for "Super Sport Electronic Fuel Injection." It denotes a high-performance version of the vehicle that features a supercharged engine, providing enhanced power and performance compared to the standard models. The SSEi was known for its sporty styling and advanced features, making it a popular choice among enthusiasts.
The most common reason for the harmonic balancer breaking on a 1994 Pontiac Bonneville SSEI is the inner and outer mass is breaking the balancer down. This happens because your engine is running rough or too high of RPM's.