C8V6C

Hey guys, my 05 UL has about 77k on it now.

While driving out of the blue, I got a check engine light, trac off, etc. Driveability is fine and gas mileage hasn't suffered much.

I pulled code P0057 the first time...reset it, and within 5min it came back on again.

Drove on it for a few days, and pulled two codes...same P0057 and now P0158. After clearing, it immediately came back on after about 5min of driving.

Isn't 70-80k a bit early for the O2 sensors?

I found this thread, and I am confident with the information I can tackle them myself on my days off coming up :

https://www.clublexus.com/forums/ls4...t-numbers.html

Should I splurge the extra money for OEM or just go with the Denso or Bosch?

I did recently run over something on the freeway, but I think that if it somehow hit the sensor or cut a wire, it probably would have immediately threw the check engine light. The light came on a couple days after, so I doubt it would be related.

Thanks for your help guys!

Bocatrip

O2 sensor failure is quite common on the LS430 and can occur at anytime. They are expensive as well and I would only replace with OEM parts as there is some labor involved in getting to them. I replaced one after hitting 110,000 miles. Error light came on but no change in performance. Regardless, it's important to pay attention and get it replaced.

warminwisc

Waht is the cost for an o2 sensor with labor if anyone knows.

warminwisc

I read the thread so 700 bcks for two at the dealer. does reg unleaded gas cause this or any other misuse of the LS.

yuri.ber

iTrader: (7)

I changed two top ones at 89k. OEM Denso were $200 a pop including installation at a reputable shop. Now, at 113k one of the bottom sensors threw a code, just a check engine light came on. Denso OEM is $100 plus $35 labor at the shop. $700 is a rip off.

MDSC

iTrader: (3)

Yea it's not hard denso sensors aren't that expensive I replaced bank 1 sensor 1 last year at 100k

Lavrishevo

iTrader: (1)

Hit up RockAuto. You can get OEM Denso or Bosh with the OEM connector for right around $60.00 each. Don't get ripped off by the dealers markup. Replacing both, parts and labor should not be more then $300.00 from a good shop and getting the parts yourself. I did this on my old 99 LS400. Both shipped to me was right around $130.00 Just make sure your getting the right one. Upstream = before cat / down = after.

http://www.rockauto.com/catalog/x,ca...30%2B4.3L%2BV8

Lynzoid

No f-ing bosch!!! Only DENSO sensors!!! Labour is really easy for upstreams, i'd say diy it if you can.

BradTank

The fact that both sensors threw codes at roughly the same time may mean something else is going on. I wouldn't say that's typical. Maybe some bad gas?

Regardless, don't go to the dealership for this job, it will be $700-$800 and it will probably take the technician only hour to do it. Denso is the OEM, so you'd paying extra for a box with the Lexus logo on it. I went through Amazon and bought mine.

chunkyda

I had codes and dash lights at 117,000 miles back in Sept 2011. Bank 1 sensor 1 replaced by local garage for $281.94. no issues since.

StanVanDam

At 8 years (June 2010) / 83500 km / 51884 mi , my front right sensor heater element failed (P0155). The dealership wanted $372 for the sensor and 1hr of labor @ $106/hr, plus tax on both.

I bought the sensor and did the work myself, my only cost was the sensor ($105 after shipping from US to Canada), so I saved $435 by not going to the dealership.

Avoid any risk of problems by using the OEM Denso sensor. These sensors' Lexus part numbers have equivalent Denso part numbers, and they are the exact same parts:

B1S1 O2 Sensor 234-4138 89465-50120
B2S1 O2 Sensor 234-4630 89465-50130
Rear O2 Sensors 234-4167 89465-50140

Parts.com, RockAuto, Amazon, ProStockAutoParts, etc are usually the cheapest places to get the OEM Denso sensors.

P0057 is low current in the B2S2 heater. Troubleshooting steps are:
1) measure the resistance across pins 1-2, should be 5-10Ohms at 10C, and pins 1-4 should be 10kOhms or higher. If out of spec, replace sensor.
2) measure resistance of EFI MAIN relay (located in Engine Room No.1 R/B) pins 3-5, should be 10kOhms when 0V is applied across pins 1-2, and should be <1Ohm when battery voltage is applied across pins 1-2. If bad, replace relay.
3) check various ECM voltages to ensure 9-14V across the appropriate pins, replace ECM is out of spec.
4) measure resistance of various sets of pins on wire harness for proper spec, repair/replace harness if out of spec.

P0158 is high voltage in the B2S2 circuit. Troubleshooting steps are same as above.

If replacing the sensor doesn't fix it, check the E2 connector on the ECM. Resistance across pins 7-28 and pins 8-17 should both be above 10kOhm. If so and the system still reports a failure, the next step is to replace the ECM.

Slvr surfr

iTrader: (1)

Would it be a good idea to go ahead and replace them anyway being as tho my car has 137k with no codes thrown?

Lynzoid

in short - no
in long - denso parts can last for millions of miles

AlexusAnja

Are the aft sensor interface only accessible from the vents inside, or it's just more convenient to get from inside but you can get it from underside also? Seems a long process qnd dirty to.have to.come into the car. Hope my O2 dont fail any time soon.

Lynzoid

downstreams have plugs under carpet. yes, to access plugs you will have to fiddle with vents and carpeting, BUT it's way easier than it sounds.