Maintenance required light and check engine lights are on

REDNECKCREATIONS00

MEMBER
1992 JEEP WRANGLER
4 CYL
4WD
MANUAL
89,000 MILES

I’m going to do the key dance today to get codes from check engine light, but I need information on how to handle the other light (maintenance required light). Did key dance and believe reading MAP sensor. So going to replace. I think maintenance maintenance required light is O2 sensor. Which I replaced one under motor. Is there a second somewhere? Also, once I replace all these sensors what are steps to clear light so it s not on anymore? Thanks. Please help

1 Reply

KEN L

MASTER CERTIFIED MECHANIC
43,072 POSTS

Here is information on the maintenance light and the oxygen sensors:

OPERATION

The Single Board Engine Controller (SBEC), keeps track of vehicle mileage by monitoring the vehicle distance (speed) sensor, and illuminates the Emissions Maintenance Reminder (EMR) lamp at 60,000 miles, 82,500 miles, and 120,000 miles, to inform the driver that emission system maintenance is required. After the recommended maintenance has been performed the mileage counter in the SBEC must be reset.

LIABILITY

Reseting the EMR light without performing the required maintenance may be in violation of federal law. Only after performing the required maintenance, should the EMR light be reset.

PROCEDURE

Resetting the EMR light requires the use of the DRBII or equivalent scan tool. Refer to COMPUTERIZED ENGINE CONTROLS for reset procedures.

If the SBEC is replaced, the current mileage must be entered into memory of the new controller. For more information refer to COMPUTERIZED ENGINE CONTROLS.

INTERVAL

The manufacturer recommends performing the following procedures at these intervals:

60,000 miles

https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.

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