I drove on a dirt road rougher than my car was designed for

You haven't stated which country you are in, but if it has a statutory vehicle safety test, you could assure yourself by putting in for the test to a garage you trust, and ask them to show you any problems they find.

As for the mechanicals... if it ain't broke, don't fix it. If there are problems, I would not take it to a car dealer but to a competent repair shop.

Just because the car was taken over a very rough road doesn't necessarily mean it will have been damaged. Many vehicles live their whole lives on terrible surfaces.

Keeping an eye on the OBD codes, and being aware of any new symptoms or behavior, and watching the warning lights are all things a prudent driver and owner should do. If anything appears, you should address it promptly, as you did with the tire pressure.

You're doing just fine. Keep it up.

If you have no symptoms and no codes then chances are good there's nothing wrong with your car. If you had bent or damaged your suspension you'd most likely have a vibration, or your handling would have changed, if you had cracked your oil pan you'd most likely know it by now. It's possible that there could be minor or subtle damage which wouldn't show up in a code or have an obvious symptom, like a lost heat shield or body damage which could weaken the structure of the car or lead to it rusting out. It's impossible to say whether you have any of these or not, but you're probably absolutely fine - cars can take a lot of punishment.

If you really want assurance it would make sense to have a visual inspection by someone who knows what they are looking for, either a professional or knowledgeable amateur mechanic needs to get under it and have a good look around. There's no harm in looking yourself, although if you aren't mechanically minded you might not spot important things. 'I think I broke it' is a phrase that will have less scrupulous mechanics rubbing their hands together with glee, so if you do take it somewhere make sure you can trust them not to rip you off. Dealerships are famous for gouging, I would suggest you take it to an independent shop with a good reputation.

Unless you're driving a luxury car you would have a bare minimum amount of sensors and most of which relate to combustion or the electrical system. If you happened to knock your O2 sensor loose then your car would let you know.

Check all your fluid levels under the hood and make sure none of them are low. If any of them are low then top it off and see if it drains quickly. Check for wet or oily spots on your driveway after leaving the car parked for a few hours.

If anything you very likely messed up your car's alignment. Drive it on a straight road and loosen your grip on the steering wheel. If your car pulls left or right then you need to get an alignment done.

Depending how much bumping you actually did then you you could have damaged some suspension components which your OBD scanner would not report. Bottoming out is likely to damage your exhaust, brake lines, oil pan, radiator, or gas tank.

You can take your car to a certified Toyota dealer and ask for a 160 point inspection. If they find anything wrong then they will let you know; if it's not life threatening then they will let you drive the car off the lot so that you can choose a mechanic you trust. Are you in New York? Don't wait for the yearly inspection or else you will suddenly find yourself with no choice other than to pay an exorbitant repair cost.

You went off road, so take it to an off road shop that services Japanese vehicles.

A dealer or conventional shop can replace damaged assemblies but will not be able to help with damaged components which connect the suspension to the body.

An off road shop will know how to look for fatigued suspension components such as control arm brackets showing early signs of failure and can reinforce them if needed. A body shop is another option but you'll be less likely to find knowledgeable dirt enthusiasts at one.

I'm not a regular poster, posting as a guest, but felt I needed to carm your fears without causing you to ignore any real problems. Driving on a dirt road, even a rough dirt road won't by its self cause you any issues. I have owned a 2007 Corrola since new and I live in the country and drive on dirt roads every day without any problems, save to say it gets dirty. Yes I have bottomed the car out many times, even on my driveway, the goat track that leads to my house, worst to happen my "sump guard" is non existent, but the car keeps on ticking.

But to your problem, your only symptom is a tire pressure warning light, this is not a standard feature on these vehicles so I can't speak to it specifically beyond saying that it coming on obviously points to a sign of abnormal air pressure in the tyre, could be high or low, simple as that, or wiring to the sensor was impacted by dirt or some mechanical injury. Forget any other issues that your conjuring up in your mind. You had this seen to and you say fixed, if your tyre pressures are OK then that's that, drive on.

Corrola's were developed by trial in rally car competitions, over very tough roads, all around the globe, they are tough as nails in this regard. So as others have advised, unless you notice something else unusual, I'd say your car is fine, just enjoy it as I have mine all these years.

Things that could happen if you drive a car off-road

1. Dirt building up on the inside rim surfaces, causing imbalance. Symptom: vibration at 60-100km/h with the frequency of the wheel rotation. Cure: pressure washer.

2. Hits on the bottom damaging things that are available from down under. Depending on the car, these may be:

• the exhaust system (symptom: loud exhaust),
• protective covers (symptom: parts hanging off the bottom),
• engine oil sink (symptom: oil leaking from the car)
• suspension (symptom: worse directional stability, bumping noises when going over potholes)
• fuel tank and fuel lines (symptom: fuel smell, fuel leaking)
• other things that car manufacturers put on the underside against the common sense, damaged

All these things can be inspected visually in whatever car workshop. Pressure washer advisable as well.

3. Paint scratched from vegetation. Symptom: scratches on the sides. Cure: polishing and/or repainting (expensive, may as well not worth the hassle).

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Probably nothing really bad happened. Just have the car bottom inspected.