C320 THE ODOMETER GOES FROM 50 TO ZERO AND STARTS TO GO BACK AND FORTH THEN JUST DROPS TO ZERO. FIRST I CHANGED THE HUBS AND STABIZER BAR THIS CAUSED THE ABS AND BAS AND ESP LIGHT TO START FLASHING . I THEN CHANGED THE SPEED SENSOR. THIS DID NOT WORK .

Bad pressure sending unit?

Hi, I had the same problem. For my malibu (2000) it was a faulty ignition switch. I replaced it and the instrument panel works fine.

Oil Pump or cam bearings

When if you exceed the limits of the odometer, in this case by driving one million miles, the odometer will start again at zero. Before the 6 digit odometers became common, you would see many cars that were over 100,000 miles and the odometer had "turned over". Million mile odometers were not common until the early 90's, so you will still see cars with the 5 digit odometer!

If there are any problem in your odometer, you can fix it by the a Odometer Correction Tool

Like the DP3 Digiprog3 :

http://www.xcardiag.com/wholesale/digipro3-odometer-correction-tool-mileage-tool.html

a dirty or faulty MAF sensor can cause proplems like this. try cleaning it with CRC MAF cleaner you can get it at just about any autoparts store. the MAF is located on the air intake disconnect the electrical connection and remove the sensor be careful not to damage the fragile filaments inside. there is no need to wipe it just spray it clean and let air dry be sure to spray all parts plug, filaments everything

The 4.3 engine should have 20 to 30 psi at idle cold and around 50 to 60 psi running down the road. Has this engine had regular oil changes? If not the problem could be sludge build up. The oil pressure sending unit could be the problem. If in question about the sending unit install a mechanical gauge and watch the pressure.

1. With your car OFF, place your key in the ignition and turn to "On". Do not start the car.
2. Find the odometer button and press until it reads the total odometer setting, (not the Trip A or Trip B setting).
3. Turn the key to OFF.
4. Place your finger back on the odometer button, press and hold. At the same time, turn the key back to "On".
5. Hold the odometer button in until the MAINT REQD light goes out...should take about 8-10 seconds.

page 77 of the 2004 Lexus rx330 handbook...
(you will find the answer you are looking for in resetting your maintenance light.)
with the odometer reading visible, (not trip A or trip B..) turn off engine.

While keeping Odo/trip button depressed, turn ignition back on (not starting the engine) You will see dashes (instead of numbers) on your odometer disappearing one at a time. it will be replaced by 0's (zeros).. Release the Odo/trip button and your original mileage will come up....
And your done..... until the next oil change.

Thank you for using fixya and good luck

I have had the almost same problem twice. A 'thump', like the engine missed a fire and tach drops. Seems OK after restart. Electrical? Timing chain slip?
Has 135,000 mile. Any clues?

The cooling temperture send unit is send out of range data to the computer (ECU).

The corrective is to buy a coolant sending unit and replace it.

The unit is withing 6 inches from the thermostat housing.


Since your car is a 2002 and probably has around 80,000 miles on the odometer so it's a good time to all of the following on the same time.


temp. sending unit / clean the contacts

drop bottom coolant has and flush radaiator

change 195 F thermostat and gasket + seal with black RTV.

Fill 50/50 mix coolant. /// if you live in aub-zero temp area then read the chart on the bottle for the recommended mix


Please rate my answer if it's helpful to you.



Cheers,

MUSTGO

its a loose connection, i've dealt with it in my truck for years, you can remove the entire dash to check all connections and change lights but its a HUGE job., if you can live with it, otherwise take it to a pro to have it done.