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Check engine light is on in my 2007 spyder gt local shop…

Check engine light is...

Check engine light is on in my 2007 spyder gt local shop told me to replace cat on rear bank, car runs great , 99,000 miles, is it possible it could be a bad 02 sensor?

Mechanic's Assistant: Does the light stay on, or does it blink?

Stays on , has been on for close to a year

Mechanic's Assistant: What is the model of your '07 Mitsubishi?

Eclipse conv. gt

Mechanic's Assistant: Are you fixing your Eclipse yourself? What have you tried so far?

Hope to fix it myself, so far have not done anything because the car runs great but I have to renew plates this year, car is only driven in the summer

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3/15/2018
Eric
Eric, Automotive Repair Shop Manager
Category: Mitsubishi
Satisfied Customers: 35,187
Experience: 20+ yrs. experience as repair shop manager and technician.
Verified

HI,

3 possible causes - catalytic converter, rear O2 sensor, exhaust leak

If no exhaust leak, then the O2 sensor should be monitored with scan tool with live data feed. If voltage readings do not change constantly on the O2 sensor reading, replace the sensor

If the readings do change and no exhaust leak, replace the catalytic converter.

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Eric
Eric, Automotive Repair Shop Manager
Category: Mitsubishi
Satisfied Customers: 35,187
Experience: 20+ yrs. experience as repair shop manager and technician.
Verified
Eric and 87 other Mitsubishi Specialists are ready to help you
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Customer reply replied 5 months ago
if my cat was bad would it make the car run rough?
Customer reply replied 5 months ago
thanks , cant justify 26 bucks for a phone call

HI,

Only about 30-40% of the time will that happen.

The code is NOT for a clogged or restricted cat although that can set the code. The code is for catalytic efficiency below threshold. This means that the readings are below parameters for efficiently reducing emissions. This can be from the converter material being degraded, the converter material being melted or broken, engine burning oil which reduces the efficiency of the converter

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