GEDDES AUTO REMOVE & REPLACE EXHAUST CATS —
CATALYTIC CONVERTERS

AUCKLAND 636 7064

Geddes Automotive garage is in Onehunga Auckland. We stock and replace broken, blocked, over heating and exhaust cats that rattle. If your catalytic converter warning light is on and you‘re in Auckland we can help you.

WHY IS MY CATALYTIC CONVERTER WARNING LIGHT ON?
WHY IS MY CHECK ENGINE LIGHT ON?

The vehicles computer controlled engine management system has detected a fault in the catalytic converter. On some vehicles the computer has turned the catalytic converter warning light on and on other vehicles turned the check engine light on to warn you there is a problem and to get it fixed before engine damage occurs. Your engine could be over heated.

The engine management system has an oxygen sensor before and some after the exhaust catalytic converter to measure the oxygen in the exhaust gasses (NOx emissions), the sensors send data to the vehicles ECU computer and the computer adjusts the opening time for the injectors. This adjusts the mixture of the air and petrol or diesel to the combustion chambers and improves the economy and emissions of the vehicle.

The ECU periodically tests the catalytic converter by checking the capability of the cat to store oxygen. If the exhaust cat is damaged or removed it can upset the readings these sensors receive. This can upset the computer management system and bring up the catalytic converter warning dash light.

Some exhaust cats have a heat sensor in the body. If the heat build up is too high it can set a computer management fault and illuminate the exhaust cat dash light. If this light comes on it is warning you that something is wrong. You should seek advice.

Without the catalytic converter the sensors and the ECU would fail to operate correctly, the mixture would not adjust correctly, the vehicle would not be as efficient as it should be, the vehicle would produce more bad emissions and humans will breathe dirty air.

The vehicles ECU will set an error and bring up a MIL light (cat dash light on, check engine light on). Your vehicle will likely fail a WOF check and if driven would likely be driven illegally. Your fuel bill will likely be higher.

If you do nothing about it most modern computer systems will reduce engine power to help protect the engine against damage such as being over heated. Your engine may just have enough power to get you off an intersection; you may not be able to limp home. Be careful the engine could be over heated.

NOx EMISSIONS IN AUCKLAND:

NOx emission levels in Auckland are reported as being higher than acceptable. Catalytic converters reduce the NOx levels and improve the air quality we breath.

An exhaust cat is the short name for an exhaust catalytic converter.

The exhaust cat‘s prime purpose is to clean and convert the vehicles exhaust gases into gases less harmful to people, animals, birds etc that breath air.

WHY IS MY CATALYTIC CONVERTER NOT WORKING?

The reason the cat is not working correctly will most likely be because it is broken, blocked or coated in oil.

The ceramics could be broken and twisting in the catalytic converter case causing the blockage. The ceramics could have broken up totally and moved down the exhaust system and caused a restriction reducing the exhaust gas flow and the engine power. Refer to the photo of a customer‘s muffler with all the broken cat pieces blocking the muffler outlet.

This can be caused by age, heat, raw fuel passing through the engine un — burnt and being burnt in the catalytic converter causing over heating of the cat. Excessive temperature can destroy the cat and the engine can be over heated.

Oil or other impurities may be coating the walls of the cat. The cat may have lost its ability to store oxygen.

CAN WE REPAIR A CATALYTIC CONVERTER?

The engine fault that is causing the cat to set an error can be repaired. The cats are self cleaning to a point, so as long as you catch the problem early and repair the engine fault you may preserve the cat.

WHY DOES MY CAT RATTLE?

A catalytic converter develops heat to work efficiently. If they exceed the normal heat range they are designed to work within this can expand the special metal casing. The casing no longer holds the internal ceramics firmly causing the rattling.

The ceramics can break up also causing a rattling sound.

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Onehunga Auckland is close to Ellerslie, Greenlane, Hillsborough, Mangere, Mt Eden, Mt Roskill, New Market, One Tree Hill, Otahuhu, Penrose, Royal Oak.