JPAL

Hi everyone i need help with my 2000 lexus rx300 it started with a check engine light and i got a OBD2 scanner and got codes P1155 , P1135 so i replace O2 sensors (denso 245-9009) bank 1 sensor 1 and bank 2 sensor 1 then the CEL went away for 5 months and the CEL came on again and this time it was flashing then i have codes P0300 , P0301 , P0303 , P0305 , P0171 , P1150 , P1135 and P0125 . so now I don't where to start i oredered parts online NGK laser iradium spark plugs , set of ignition coils , radiator cap , coolant temp. sensor ,MAF sensor cleaner and timing belt kit. parts is arriving today i just want to ask if there's anything you guys can suggest what else i have to replace at this point i don't know whats going on with my car it already have 170k but ive been taking good care of it for 10 years.

salimshah

You are now 3x the base warranty and typically sensors start failing.

If you plan to DIY then do not make all the changes you plan at one time.

Recommended replacement for spark plugs is 110k miles. If you have not followed it, then replace the plugs .. just match the type an make of the plugs you pull out.

Clear the codes and monitor for the first code.

For the second timing belt change, I would add replacing seals [main front, cam seals] and water pump if it was not done during 1st T belt change.

Nothing says you should not perform all the work you outlined all at once, but I would do one thing at a time. Fix CEL and then the maintenance part.

Salim

JPAL

timing belt and water pump was replaced at 78k at the dealership and spark plugs i replaced them with bosch 4 prongs before at 120k then at 150k i change it with ngk iradium plugs then now i am planning to use laser iradium i can remeber what was the original plugs since i change them all the time and i'm planning DIY i have the tools to do it but i just need the knowledge lol my original plan was to do it all at once hoping i get lucky and fix the problem coz i dont want to be stranded agian and cost me 120 dollars for towing to get me and my car home. by the way when the CEL light was flashing the car looses power and very rough idle i tried to drive it home but the engine compartment was smoking and can't find where its comming from so thats the time i called towing. so now you suggested one at a time so i will start with spark plugs and since the ignition coils is arriving today i will just install that one too and go from there thanks

carguy07

That sounds like B2S1 to me (I know you just replaced it). I would replace that and only that and see if it fixes it.

JPAL

ok guy i really need help on this now i have change laser iradium spark plugs already and 6 ignition coils everythings brand new and i put back my old o2 sensor b2s1 and i have all the same P0300 , P0301 , P0303 , P0305 , P0171 , P1150 , P1135 came up and car idles very rough does not accelerate no power at all so i guess my old plugs and coils are good afterall i have no luck and now dont know what to replace does anyone knows whats going on with this car?

JPAL

damn auto spell check i sounded very rude lol i really need help on this one after i change plugs , coils and o2 sensor b2s1 i still have problems with the car codes P0300 , P0301 , P0303 , P0305 , P0171 , P1150 , P1135 came up does anybody encounter this kind of problems before?

carguy07

What is in B2S1 right now?

JPAL

carguy your right i put the old o2 sensor that came with the car on b2s1 then erase the codes on obd2 the car runs normal now and i'm back with the P1155 code like 6 months ago so i guess i bought a defective o2 sensor thank you for your help guys

JPAL

Hi guys im back again with my 2000 lexus rx300 p1155 and p1135 and this time i purchase o2 sensors from orielly's denso 234-9009 i got 2 of them and after i install the o2 sensors when i start the car is almost didnt start then when i drove the car it hesitates like i have a missfire and then died i start the car agian maybe 5 times before it starts and luckely i got it back in the ramp . i tok the new sensors off and put back my old defective one's and start the car it starts rigjt away and runs like a champ. one thing i notice when i remove the new o2 sensors it smells gas. i never got a CEL on with the new sensors coz the car didnt even run 2 blocks its just off my drive way and back inside the garage. does anybody know whats going on with this car? please help me i spent a lot of money already and the CEL is on it bothers me when i drive . p

carguy07

Are you clearing the codes and getting it out of limp mode before going for a test drive?

JPAL

yes before i start removing the old sensors i clear all codes with obd2 scanner and the pending codes too then i disconnect the negative battery then i change the o2 sensors . but even before installing the new o2 sensors i was driving the car with no missfire or any problem it runs like normal but every 20 miles CEL comes on with p1155 and p1135 then i erase it agian then after 20 miles it comes back on thats why i change both oxygen sensors with brand new one but instead the car missfires . car is newly tuned up i change NGK laser irradium plugs , denso ignition coils , radiator cap , coolant temp sensor , timing belt , water pump , idler , pulley , tensioner , valve cover gasket and intake manifold gaskets hehehe sorry i have to put all of it on there and its been done by my friend professional mechanic i was there just to help out

JPAL

i went back to orielly's and exchange the o2 sensor that i just bought from them and install both sensors agian b1s1 b2s1 and clear CEL before i turn on the car and at first it was rough idle then went to normal but when i start driving the car the transmission shifted at high rpm and sometimes it hesitate to shift gear and when it shifted gear it will jerk. i know this sounds like a tranny problem but if i install my old broken sensors it runs normal does anybody know whats going on with my car please help thanks