Hi, I wonder if anyone can offer any advice on this one.

My 2000 Yaris (32000 miles) failed the emmisions test and the garage which carried out the MOT test(I'm in the UK) suggested I take it to a Toyota dealer.
No engine loght had come on.

After "looking" at the car they suggested first trying to change the oxygen sensors (2) as that was the cheaper option and secondly if that didn't work changing the catalytic converter.

I couldn't believe this amateurish diagnostic approach and said surely there must be a way of testing the sensors.

Can anyone offer any advice

Many thanks


Andrew

I should have given the readings

Fast Idle

CO 1.5% Fail
HC 045 PPM Pass
Lambda 0.961 Fail

2nd Fast Idle

CO 1.0% Fail
HC 022PPM Pass
Lamda 0.971 Pass

Natural Idle Test

CO 4.85% Fail

You could try adding some octane booster if you didnt the first try. It'll make your engine run a little hotter so it burns more gases.

Hi, I wonder if anyone can offer any advice on this one.

My 2000 Yaris (32000 miles) failed the emmisions test and the garage which carried out the MOT test(I'm in the UK) suggested I take it to a Toyota dealer.
No engine loght had come on.

After "looking" at the car they suggested first trying to change the oxygen sensors (2) as that was the cheaper option and secondly if that didn't work changing the catalytic converter.

I couldn't believe this amateurish diagnostic approach and said surely there must be a way of testing the sensors.

Can anyone offer any advice

Many thanks


Andrew

I should have given the readings

Fast Idle

CO 1.5% Fail
HC 045 PPM Pass
Lambda 0.961 Fail

2nd Fast Idle

CO 1.0% Fail
HC 022PPM Pass
Lamda 0.971 Pass

Natural Idle Test

CO 4.85% Fail


Indeed the oxygen sensors and the catalytic converter arent doing their job. Change both oxygen sensonrs and do an engine flush to clean out the burned oil. That should be able to do it. If that fails have your catalytic converter CHECKED by a Muffler specialist.

Hope it helps.

JJ

Hi, I wonder if anyone can offer any advice on this one.

My 2000 Yaris (32000 miles) failed the emmisions test and the garage which carried out the MOT test(I'm in the UK) suggested I take it to a Toyota dealer.
No engine loght had come on.

After "looking" at the car they suggested first trying to change the oxygen sensors (2) as that was the cheaper option and secondly if that didn't work changing the catalytic converter.

I couldn't believe this amateurish diagnostic approach and said surely there must be a way of testing the sensors.

Can anyone offer any advice

Many thanks


Andrew

I should have given the readings

Fast Idle

CO 1.5% Fail
HC 045 PPM Pass
Lambda 0.961 Fail

2nd Fast Idle

CO 1.0% Fail
HC 022PPM Pass
Lamda 0.971 Pass

Natural Idle Test

CO 4.85% Fail


androidGB,

Over here in the States I usually take my 89' Camry for a nice long drive somewhere for about 1/2 hour or so on the highway. The trick is to get the converter as hot as possible so to burn an excess emissions.

Try that nd see what happen.


rimfire,22