Russelltw

Board,

I have searched all over this and another lexus forum, but end up being confused about what I need to do. I have an es300 1999, i have the CEL and TRAC off lights on. I have the codes read: P0125 and P1135.

I am confused about doing something with the MAF and doing replacing the 02 sensors.

Any advice as to where to start?

THanks
Russelltw

JSM1284

Sounds like a A/F sensor problem.

Russelltw

Is this the same as a air flow sensor located right after the air filter?

JSM1284

No, The A/F sensors are located on the Exhaust.

Russelltw

so far, I have replaced the air flow sensor after the air intake filter. I am still getting the p0125, p1133, p1135. I had it reset a couple times to make sure it was not a false reading. THe guy at advanced auto parts said I should disconnect the battery to reset the computer, but I would think the new air flow sensor would fix the CEL (check engine light) if it were the cause. Your thoughts or expereince?

I am wondering if I replace the air/fuel senor between the firewall and the engine? Would this fix these codes? Also, air/fuel sensors are not the same as 02 sensors, correct?

Thanks
Russell

schase

i got the same problem wit my 98es but neva tryed 2 fix it

Russelltw

Talked to advanced auto parts guy, who said the o2 sensor must be the same as an air/fuel sensor. They look the same and seem to be located in the same spots.

So I replaced the easy one (located near the front) and reset the light via removal of the fuse. CEL came back on so, I am going to replace the one between the firewall and the engine with the new one I purchased.

I will let the board know in a couple of days.
Russell

Russelltw

Board, I have changed my o2 sensor between the engine and firewall. It wasn't that bad. It took about 1 hour to do, from pulling out the front sensor (I tried that one first to see if it would fix the check engine light CEL), putting the car up on a ramp to get under it, to replacing the sensor. I tested the o2 sensor with an ohm meter before I removed it. It gave no readings so I replaced it. I will give it a few days to see if that fixes it.

thanks for the forum
Russell

SolTrain99

iTrader: (1)

i have the same problem with my wife's 1999ES. (TRAC OFF and CEL)

I changed one 02 Sensor. Its the one you first see when you open the hood. Do i have to change another one? You said you changed something from underneath?

SolTrain99

iTrader: (1)

i replaced the 2nd O2.. which I had to go under the car to change. It was a $&^%$^%$^% to take off.

Drove it for about 2-3 hours today and no more CEL or Trac Off. I do see the AIR BAG light blinking once in a while. (don't worry i'll search for that)