Es300guy2k

Hello guys
I have 2000 es300 ,I have recently replaced O2 sensor bank 1 sensor 1 now she is throwing p0171 and P0330,I found out that p0171 means I need to clean MAF/or replace and p0330 means bad knock sensor,
I cleaned MAF sensor but it still shows p0171 and Fuel trim ratios are off(please see attachment),long term bank 1 &2 is around 44 and Short term is 5 and -1, I think it means still there is too much air(lean),I am getting new MAF sensor in few days from Amazon.
should I wait another few days to replace knock sensor(Hoping that these are connected and fixing MAF might take care of other code?) are these two problem connected? Someone suggested that p0171 could be leak from manifold or brake booster
Please share your thoughts.

fortitude

Did this occur immediately after the changing of the sensor?
Which brand sensor did you use?
Did you confirm if it needed CA spec sensor & was your model year an A/F sensor for Bank 1 S1 or as you refer to O2 sensor?
Whats the short term fuel trim & long term fuel trim readings at idle?
Does your scanner show fuel system in "closed loop" status when at operating temp?

Es300guy2k

Yes, I changed the sensor and the check engine & traction on light came back after driving few miles.but this time code were different

I used Bosch 15733 Oxygen Sensor, Universal Type Fitment , It was Bank 1 Sensor 1( the one thats little hard to reach) the code was P0135

Only after reading your comment I realised some lexus California models use the Air/Fuel Ratio sensor and thats different than o2 sensor.
I think mine is a california model I looked up the carfax:-

Independent Source VEHICLE MANUFACTURED AND SHIPPED TO DEALER
11/27/1999 CA
5 Motor Vehicle Dept. ODOMETER READING FROM DMV
12/20/1999 RANCHO MIRAGE, CA
Motor Vehicle Dept. REGISTRATION EVENT/RENEWAL
12/30/1999 RANCHO MIRAGE, CA
Motor Vehicle Dept. TITLE .....

I tried to see which short term reading is Ideal .but now its giving me different code, it's p0100 and p0110, I guess MAF sensor has intake air temp sensor that must have been stopped working.

fortitude

My opinion - Use DENSO or OEM only. These cars do not always function well with aftermarket electric components

Did you have to cut the original connector to accommodate the universal Bosch connector?

What prompted you to change the sensor?

Es300guy2k

I had code P0135, I googled & it was Bank 1 Sensor 1.
well you might be right let me change O2 sensor to OEM one and get a new MAF, hope fully this might resolve the issue.

crwys

I agree with fortitude. Using an oem o2 sensor may very well solve all your problems

fortitude

What product did you use to clean the MAF?

With the negative terminal removed from the battery, and the ignition in the off position, disconnect the MAF from the wiring harness. Check the connectors are clean. Reconnect the MAF and you should see the tab "click" into place.

Reconnect the negative terminal.

Not familiar with 2000, but with my 2002, I take off passenger front tire, remove the small splash cover inside the fender well and Bank 1 Sensor 1 is much easier to reach coming in from that direction.

Es300guy2k

Hi Fortitude I used electric spray cleaner as it does not leave any residue after quick evaporation. Edit: I am getting new code of p0441.