Yaris failed on emissions

Sam Kade

Low idle CO 3.38 vol% Above 0.50
620 rpm. HC 287 ppm Above 00 ppm

Lambda 1.01 between 0.97 and 1.03
High idle CO 0.00 vol% above 0.30
2700 rpm HC 47ppm above 200ppm

The high idle is perfect, would it be the cat or a sensor?
00 yaris

ongarite

Can you print out the whole emissions report?
What's the lambda value?

Sam Kade

ongarite wrote: »

Can you print out the whole emissions report?
What's the lambda value?

Done

fancy pigeon

Drive the ring out of the car then try some cataclean first

PukkaStukka

Sam Kade wrote: »

Low idle CO 3.38 vol% Above 0.50
620 rpm. HC 287 ppm Above 00 ppm

....

The high idle is perfect, would it be the cat or a sensor?
00 yaris

Is that car misfiring / running lumpy at idle, or burning oil?

What's the mileage?

Sam Kade

PukkaStukka wrote: »

Is that car misfiring / running lumpy at idle, or burning oil?

What's the mileage?

140k miles
No burning oil or misfiring
Running smooth at idle

Cerebrum

Cat should be fine given high idle. Have you had it plugged in to check for stored codes?

Sam Kade

Cerebrum wrote: »

Cat should be fine given high idle. Have you had it plugged in to check for stored codes?

Mechanic is changing the cat today, he checked for codes and it showed no faults.

Stoolbend

Cat looks fine with them readings. That's going to be a temp sensor or airflow meter.

The fact the co is passing at high idle rules out the cat. If he fits a spurious cat you'll only have more problems next year.

Cerebrum

Without fault codes, I'd be swayed toward a pinhole leak around the exhaust manifold area, which draws in air over the lambda at low idle, fooling the car into creating a rich condition, but creates enough backpressure at high idle to prevent air ingress or even leak outwards.