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Mazda MPV DX: I now have a 2001 Mazda MDV DN. Have 2 check

Answered by:Ron Z.
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Customer Question

I now have a 2001 Mazda MDV DN. Have 2 check engine messages.
P0031 and P0481. Need to know location of heat sensor and what to do about P0481. Thank you - Bob

Country: United States
Make: Mazda
Model: MPV DX
Year: 2001
Engine: 6 CYL

Already Tried:
Haven't tried anything.

Submitted: 282 days and 23 hours ago.

Category: Mazda

Value: $22

Status: CLOSED

Accepted Answer

Expert: Ron Z. replied 282 days and 23 hours ago.

Welcome! I'm Ron Z! I will do my best to answer all of your questions. For easy access to this thread, bookmark it now! Please read everything!

The P0031 is a fairly straight forward code pointing to a fault with the internal heater for the Oxygen Sensor for Bank1 Sensor1. The on-board computer uses this internal heater to get the sensor to normal operating temps within a matter of seconds on cold starts. Inspect the electrical connector for any loose, broken or damaged wires. If the visual inspection checks ok, replacing the sensor will solve the problem. The Oxygen Sensor for Bank1 Sensor1 is on the side of the engine closest to the windshield, mounted to the exhaust manifold.

The P0481 is pointing to a fault in the Cooling Fan Relay, HOWEVER, this is actually a "known problem" and Mazda has issued a Technical Service Bulletin that states, as long as the cooling fans are operating properly (they come on when needed, and there is no over-heating problem) then the problem will be due to improper calibration of the on-board computer, and it will need to be reprogrammed with the new, updated calibration software.

Expert Type	- Mazda Tech -
Category:	Mazda
Pos. Feedback:	98.9 %
Accepts:	196
Answered:	6/26/2012

Experience: 18+yrs experience. State Inspector and Mazda Diagnostics

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