jevanof

Hello I have a 99 RX300 and the check engine light was flashing on my way home from work, here are the codes that I am receiving.

P0300
P0301
P0302
P0303
P0304
P0305
P0171
P0136

I cleared the codes and all 12 came back

Any suggestions other than take it to a shop would be greatly appreciated.

jevanof

also it was consuming oil so i put 1/2 a bottle of seafoam in it. that happend 2 weeks ago.

not sure if that can play a role in this but I wanted to mention it.

hypervish

Yes, the seafoam can cause the car to misfire. But, 2 weeks later, unlikely.

How many miles are on the RX? Have the spark plugs been changed? Which code came back first?

jevanof

170k miles,
all codes came back at the same time, but there is a good chance i did it wrong, also i put the seafoam in the oil

jevanof

plugs were changed a year ago

kalali

Seafoam in oil? I thought it was supposed to be put in gas or through the intake? Regardless, I doubt that is your problem after two weeks...

jevanof

ok so should i change the downstream o2 sensor?

i need to get this fixed this weekend as its my only car and i have to work Monday.

jevanof

also i checked a ton of threads and nobody list a solution, they disappear like a fart in the wind.

I promise to post the resolution when this is done, i just need advice on what to do.

code58

1st piece of advice is don't let Sea Foam anywhere near your car, PERIOD!

salimshah

What was the reason to reach out for seafoam? Maybe something was going on before the treatment.

Salim.

ps: By default, I am against additives.

jevanof

it was getting crappy millage and consuming oil, i looked for sludge and found nothing so i figured something was gunked up and hoped sea-foam would clean that out.

i drained and changed the oil, but i still have a non running car. i went the change the downstream o2 sensor and the previous owner broke the studs and cobbled a new one on. I am thinking about taking it to a shop now.

jevanof

ok, i changed the oil, replaced the downstream o2 sensor and it still ran rough, i again checked the codes and P0304 was present, so i changed the coil for #4 and it runs great, but... when i start it up after its been sitting, it smokes for about 3 minutes.