Hi - I have a 1999 Landrover Discovery with 180,310 miles, which my husband and I absolutely love. Engine type 4.0L V8 OHV (MFI). Needs repairs to pass inspection, and the quote I received from the Landrover dealer (!) was too much for me -- the head gaskets are leaking oil onto the oxygen sensors (?), so my check engine light is on and I can't get it through the inspection. And we have a slow coolant leak. I don't know what to do, so I was wondering if anyone here has advice about repairing vs. selling at this point. Is it really time to offload the car?

 

The oil leak is unlikely to be the head gaskets, but rather the rocker cover gaskets. After replacing those gaskets, you should be able to replace the O2 sensors and pass inspection.
Coolant leaks could be serious or relatively benign. Having the codes read will help with the diagnosis.
Find yourself an independent workshop rather than a dealership. They'll usually give you better (and more detailed) advice than the authorised dealers.

 

Oil leaking ON to the O2 sensors would be the valve covers leaking...but would not effect the O2 sensors in any way at all. It would just be oil on the outside of the exhaust pipes, and dripping on the ground.
If a code states that the O2's are fouled by oil in the exhaust, you basically need an engine rebuild.
But, if there was/is oil in the exhaust, you would have a misfire on one or more cylinders, aka, running very rough, and barely driveable.
Which doesn't fit what you described at all.
As said, the coolant leak could be simple, or expensive.
Regardless, if you can't pass emissions because of a check engine light, that's no problem. Remove the bulb...seriously. If it won't pass emissions because of the tail pipe sniffer test, then the engine needs work. As simple as a new 02 sensor, or as much as a rebuild.
Where are you located? I would want a second opinion.

 

It's not that the oil gets onto the O2 sensor, but rather that it gets into the plug connecting the sensor to the vehicle harness. This is a well-documented issue, and much simpler to address than rebuilding the engine when you probably don't need to.
Removing the bulb is a stupid idea, because the problem code will still show up when the examiner plugs a reader into the OBDII port.

 

That's why I asked for location.
Not everywhere does emissions and ob2 testing...even in the same state. Northern Va, emissions test. Everywhere outside of NVa, no emissions tests. And legal. Other states vary also.
So removing a bulb is not "stupid" everywhere you go.
It's so simple to do, and saves hassle depending on where you are.
As far as oil in the O2 connectors. Clean them.

 

There are dozens of threads on this forum about how oil in the connectors has caused problems with O2 sensors. Sometimes cleaning seems to work; most often it doesn't.
The CEL is there to let you know that something is wrong. Right now, the OP has at least one issue that is causing it to light, but there could be multiple problems that haven't even been diagnosed yet. Or fixed. And the permanence of those fixes is undetermined.
The CEL is a warning system. Removing a warning system is, to me, a very stupid thing to do.

 

Temporarily removing a bulb, that under certain circumstances, is the difference between a sticker or no sticker, is not "stupid" at all.
Again, why I asked the location.
Not everywhere legally checks the same things.
Some garages won't give you a sticker if a check engine light is on. Some will if no lights are on, and again, depending on location, won't even hook up ob2 if no lights are on.
Some of us like our vehicles legal and driveable while we fix the problems.

And, it was at the dealer. If there were more problems/codes...they would have told the op...that's how they make money.
Your truck needs, this, this, this, ect.
But, apparently they were only told, oil on O2's, and coolant leak.