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O2 Sensor - broken but no code?

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Old 02 Dec 2010, 11:58 pm
Fresh Cruiser
Join Date: Apr 2010
Location: Noo Zeeland
Posts: 4
Default O2 Sensor - broken but no code?

Just had our 2005 PT serviced after some misfire and acceleration/hesitation probs. The mechanic says the O2 sensor has shown up as not working on their diagnostic test but it has not/never has shown an error code on the instrument panel?
He estimates NZD$250-300 to replace incl labour. (USD$ 185-225).

I did a search and read about removing the negative lead for 10 mins. Is this worth a try?

Finally, what would be the 'typical' effect on a PT with a dud O2 sensor?

Thanks in advance.
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Old 03 Dec 2010, 08:03 am
Obsessed Cruiser
Join Date: Sep 2001
Posts: 27,744
Default Re: O2 Sensor - broken but no code?

He wants HOW MUCH to replace the 02 sensor?

I'd find another mechanic fast. This guy wants to take a vacation with your money.

You have two 02 sensors. One right in back of the engine near the exhaust header (you can see it if you look down in back of the engine. Silver thingy plugged into the exhaust manifold with 4 wires coming from the top. The other right by the catalytic converter. Neither takes that much time to replace by any decent mechanic and the parts aren't that expensive either.

Failures of the sensors? Read here:

A dead sensor will prevent the onboard computer from making the necessary air/fuel corrections, causing the air/fuel mixture to run rich in the "open loop" mode of operation, resulting in much higher fuel consumption and emissions.

An additional consequence of any oxygen sensor failure may be damage to the catalytic converter. A rich operating condition causes the converter to run hotter than normal. If the converter gets hot enough, the catalyst substrate inside may actually melt forming a partial or complete blockage. The result can be a drastic drop in highway performance or stalling because of a buildup of backpressure in the exhaust system.
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  #3 (permalink)  
Old 03 Dec 2010, 04:49 pm
Fresh Cruiser
Join Date: Apr 2010
Location: Noo Zeeland
Posts: 4
Default Re: O2 Sensor - broken but no code?

Thanks for the info and heads-up on the price.
Just went on-line and I can land a good quality Bosch sensor here in NZ for under USD$50!!

I will be asking the Dealer about his pricing in about 30 mins time

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