edupim

hi guys. I saw that Lexmex changed his oxygen sensor
( A/F sensor, and O2 and O sensor bank 1 S2)
i will want to change too, because i have a felling i spendiin lot of gas . I' m planning to use the universal sensor that fits in my RX300
I saw that Lexmex put 234- 4215 Denso.
mY question is
can i use
http://www.ebay.com/itm/Oxygen-Senso...r/121199561362

and connect the wires ? the A/F is the same ?
if not, could someone tell me exacty the part number or equivalent?
thanks in advance

aznlapin

No, do not buy anything but OEM (Denso) A/F sensors. Aftermarket ones tend to cause a lot of problems because they are not within spec for the RX300.

Also, bank 1 senor 1 and bank 2 sensor 1 are A/F sensors. They use the same sensor. Bank 1 sensor 2 is a 02 sensor, it is for emissions only and have nothing to do with fuel efficiency. That sensor is different from the other two.

edupim

thanks Josh
how about try to clean the old one. i do not receiving any code

xtwister16

My girlfriend's RX is having bad mileage too, (~13mpg), car is at 140K. It's also throwing some codes (P0171, P1150, etc)
I just bought the following:
2x Denso 234-9009 Air Fuel Ratio Sensor
1x Denso 234-4215 Oxygen Sensor
1x Denso 197-6020 Mass Air Flow Sensor

I found someone who was able to sell all the parts new for $260, I'm hoping to get the MPG back up to 20mpg once I get all these parts put in.

Do not get aftermarket sensors (aka non-denso parts), like the one in the link. Also be weary, I've heard of some people buys parts on ebay labeled as Denso, by they were knockoffs. Best bet would be to get them on Amazon, the price there is really good compared to the dealership.

Baetke

Please check back here after you install your new parts and let us know the results, good or bad. I replaced my A/F sensors and didn't see any improvement. Haven't tried the MAF sensor yet because I didn't want to spend the money until I had good reason to believe it would help. I eagerly await your results.

salimshah

Baetke:

xtwister16 is getting CEL code, and we hope that they will be cleared out by the swap.

On the other hand you seem to be hoping to get mpg improvement. Is that change you want feed back about?

Salim

Baetke

Sorry if I wasn't clear.

Specifically I want to know if replacing the MAF sensor improves mileage. I already replaced my A/F sensors and saw no improvement.
Thanks.

salimshah

When you dont get a CEL, the fuel/air/timing all are working in what I call a closed loop. The ECU keeps compensating. IMHO before zeroing on one particular sensor, you need to open the loop and monitor each sensor output and interpret the results to determine what is going on. Frankly I think that is in the realm of master mechanic at the dealership and the equipment at dealership.

Salim