Q: Do our seats have occupant sensors for airbag deployment? (side or front)

I beleive so. Can't say 100% tho

Both mine (front) went off and I was the only one in the car.

you mean the front driver and passenger airbags? ....

I don't believe so

that's what i thought.... i was a bit curious that's all.

I have a follow-up question...heated seat sensors
 

I had a loaner A6 ('99) for several days, & I was looking at the manual to confirm that its steering wheel was heated. (the coolest thing about that car, in my opinion, I'd pay for that option!) The wheel is heated when the seat heater is on.

The manual said the rear seats had a weight sensor & so would only activate when a body was on the seat. I wondered, what about the fronts? It didn't say. Then I wondered, what about the heated rear and/or front seats in my '02 A4 (ahh back in the day when you could get heated seats in an A4, the trade-off for having failing coil packs!) I get picky about making sure the 3 passenger heater wheels are set to the 0-position when no one's in my car. My girlfriend would think I was weird, but I had a Jetta before where 1 of the seat heaters died & I don't want to have to deal with that repair again & the way my Audi service people might mess up my seat like the VW mechanic did!

To recap after that longwinded mess - who knows if A4 seat heaters (passenger, rear seats) have weight sensors?

i don't think there are any... i got a ride on an A4 to the dealer once
 

the dial in the rear was set to mid-level before i got in and it was warm...

what would really be cool are massage and heated seats :-D the benz has this as an option i think.

ahh but benz doesn't have heated steering wheel. my dad misses that in his e500 vs. his old a6/a8

i think its a bit of a hazard to have the wheels heated if you ask me