1999 Lexus RX300 Questions

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i have a 1999 lexus rx300 i bought the new valve i already had this valve clean and was told if it goes bad again replace it
my radio is not turning on. power supply is OK. the display is not working also
It smokes some upon starting, but stops as engine warms up. Has only done this for say a month or so.
I recently had my front struts and front strut mounts replaced. Repair (with a 114.00 diagnostic charge) cost ~1500.00. Did I pay too much?
recently had a timing valve replaced and 5 coils. Oil level got real low before it was fixed.
Worked on 5 times now..emergency light was working before the last repair(?). This time the light bulb blew..electrical smell and now the emergency lights don't work either and the radio light is very dim. The told me it was a $900.00 fix. I suspect they may have made it worse, what do you think? Everytime they worked on it they said it was the bulb, but it burned out within a day. It blew when they put in the OEM Lexus bulb.
codes p0300-302-304-306-p1351-p1354-p1730 . should i freakout or pray? nice car but worried have to get inspection next week. engine light on.fix or run?
they say if i can find a used one I need the the original key also is this true
I'm planning to purchase side mirrors w/ signal lights built in for my RX300. However, it does not come with harnesses. Do I have to bring to a specialty shop in order to have this installed?
When I depress door lock all other door locks actuated except drivers side. I have to manually lock it inside or outside. What is cost to have this repaired?
I had a rebuilt transmission installed about 4 years ago. How often should I change the transmission fluid? I drive approx 110 miles per day during the work. Currently, I have 226K on car. Is there anyhting else you reccomend I should change pertaining to the transmission?
Last change timing belt @97K. Car now has 226K.
what is the cost of replacing the timing belt
Recent rains left water in front floor. more on passenger side. No evidence of any leaks any where other than water in ron area. Checked sunroof drain etc. Nothing found.
showing p0125, p0171, p1135, p1155
one has been showing for 4 years not sure which one but engine lite has been on that time. I cant afford to replace all the above sensors... is there one that is more critical than the others for gas mileage? Car is used just for short trips to village and church and occasional trip of 150 or so miles. Even with the little use it starts and runs perfectly. any suggestions? thanks for your help.
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