Vw jetta 2006 warning symbol of wrench appears in my mileage when I start the car. It reads 800. Then it is replaced by the symbol of a clock reading 159! What is this!?!?

Time for service

It means your car needs to be serviced. You are probably at a recommended mileage service.

I hope this helps.

02 sensor is 300 try scrap yard 40pound 02 sensor is on front of exhaust 3 wire sensor

This means that your vehicle requires service. Something is wrong. You can take it to Autozone and they will put it on their diagnostic machine for free. And tell you what is wrong. Usually nothing major. Just needs to be checked out.
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Hope this will help.
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you need to pull the codes and go from there

Should be a Bulb Out Indicator. Check all your external lights (headlights, brake lights, turn signals) and make sure they are all working correctly.

Reset the tire pressure warning, same as you would any service issue. Insert key in ignition, hold wrench button and min button, then start engine.

I have a Jetta 2005 and I just noticed that after this:
when my battery died after 7 hours playing my stereo, then I charged it for 30 minutes and my car could start on again. After that incident thet remote key started failing when I push the open button twice to open all doors. They remain closed, only passenger door open. Then I disconnected battery over 15 min to reset computer, and the clock and mileage gage remain on all time after that. Never remain on before it was disconnected and conneted again.

The negative number means the car should have had it's oil changed that many miles ago. Oil life starts at 100% for new oil & counts down every 10%. At 15% the display will always show, which means it's near time to change the oil.

usersteve83, your oil may have been changed but the timer not reset. Reset the timer as shown...
1. Turn ignition to the "ON" position. (do not start engine)
2. Press SEL/RESET repeatedly until the oil life indicator is displayed.
3. Press & hold the SEL/RESET for about 10 seconds until it blinks then let go of the button.
4. Press the SEL/RESET again for about 5 seconds or until the oil life indicator resets to 100%.

Wrench = Maintenance Minder: Symbol letter & number...
Symbol A - Relace engine oil.
Symbol B - Replace engine oil & filter, Inspect front & rear brakes, Check parking brake adjustment, Visually inpest the tie rods, suspension components,driveshaft boots, brake hoses & line (including ABS), all fluid levels & their conditions, exhaust system, fuel lines & connections.
Symbol 1 - Rotate tires.
Symbol 2 - Replace air cleaner element (dusty conditions every 15K miles) & replace dust & pollen filter (behind glovebox) every 15K miles if mainly dusty or city driving.
Symbol 3 - Replace transmission fluid.
Symbol 4 - Replace spark plugs.
Symbol 5 - Replace engine coolant.

All above are taken from the 2006 Civic EX owner's manual.