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Hi everyone,

I noticed that my gas consumption is going up (14.7L/100) so I took my car to a mechanic. It is 2005 ES300.

I knew purchasing this car 2 years that an O2 sensor is bad. It showed on the diagnostic device. Now the mechanic recommended changing all O2 sensors. He said there are 3 - 4 of them. Roughly he said it will cost 900+. 

Anyone had similar experience/advice to give me?

I live in Ryde, Sydney.

Thanks 

 

 

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Not necessarily be the O2 sensors. Fuel related issues can throw out DTC's ( Diognastic Trouble Codes) which may indicate lean/rich fuel mixture. 

I would throw in the fuel tank top quality Fuel Systsem Cleaner/Conditioner prior a fill up with Premium 98 Octane Fuel ( Liqui Moly Fuel System Cleaner Conditioner ). Autobarn, Supercheap Repco sell this stuff. See how it goes B4 starting to replace O2 sensors at that ridiculus cost and potentially getting no positive outcome.

Fuel pump/Filter is another thing which I would look into. 

You need a scan tool or someone with a scan tool to read and erase the code prior addind the cleaner and re-checking it after.

GL Bro.

 

 

Liqui Moly FuelSystemCleanerConditioner-6.0-en.pdf

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15 hours ago, Glorified Toyota said:

Not necessarily be the O2 sensors. Fuel related issues can throw out DTC's ( Diognastic Trouble Codes) which may indicate lean/rich fuel mixture. 

I would throw in the fuel tank top quality Fuel Systsem Cleaner/Conditioner prior a fill up with Premium 98 Octane Fuel ( Liqui Moly Fuel System Cleaner Conditioner ). Autobarn, Supercheap Repco sell this stuff. See how it goes B4 starting to replace O2 sensors at that ridiculus cost and potentially getting no positive outcome.

Fuel pump/Filter is another thing which I would look into. 

You need a scan tool or someone with a scan tool to read and erase the code prior addind the cleaner and re-checking it after.

GL Bro.

 

 

Liqui Moly FuelSystemCleanerConditioner-6.0-en.pdfUnavailable

Thank you, for your advice. Do you have an idea what is an ideal fuel consumption for this car in the city? 

 

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  • 2 weeks later...

Hi, I have a 2004 ES300 (MCV30R) 3.0L and my mechanic believes that I have a faulty O2 sensor. He wants me to wait until a fault light displays, but I prefer not to wait for that. Can anyone tell me if this model is pre Cat Convertor or Post Cat. Do we need to change both the upstream and downstream sensors? Where is the best place to buy in Australia?

Would really appreciate you assistance.

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Hi Peter,

If you are to replace your O2  sensors I would suggest use OE but nothing else. What some of the mechanics do is to go for an aftermarket, pay less and still charge you the OE price. You are likely to have problems with an aftermartket O2 Sensor unless it is a genuine Denso or NGK or Bosch. Denso or NGK O2 sensor/sensors is what I would use on Lexus.

Since the begining of last year, I came across with a company called SPARETO in Estonia where they have a fantastic service (good old fashion service) with speedy delivery using DHL (usually less than a week). I deal with a smart engineer called Viktor at SPARETO. 

I would contact them with your VIN and see what they suggest for O2 sensors. They are prices, including delivery, in most cases, is minimum 30-50% less than what you would pay locally.  Another place is Rock Auto in the US or LexusPartsNow in the US.

Hard to say which O2 sensor/ sensors are faulty (Pre or Post catalytic convertor). Scan should tell you which when the CEL (Check Engine Light) is on. If prices are reasonable and it is the pre cat O2 sensor it may be advisable to replace the one on the other bank. These have a bearing on fuel consuption more so than the post catalytic convertor ones. Post cat ones are usually for emmision control.

Average life expectancy for the O2 sensors is around 180,000 KM's. Pretty much similar to that of a long life premium irridium spark plug.

I hope this helps and GL. 

 

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