My 2000 Explorer runs very rough especially when I accelerate or when its loaded. Check engine came on and I bought an OBD II reader.

P0401 EGR flow insufficient and P0460 Fuel Level Sensor Circuit Malfunction came up. I cleared the codes and ran it again.
The second time P0400 EGR Flow Malfunction and P0460 Fuel Level Sensor Circuit Malfunction came up.

These seem like a strange pair of codes to come up together. Any thoughts?

 

It is possible to have two non-related codes. I wouldn't necessarily try to correlate the two codes. I doubt the P0460 would cause any driveabilty issues like the EGR code.

You might try searching this forum for what others have found to remedy the P0401 and P0400 codes. Based on the description I wouldn't be surprised if the problem is a faulty DPFE sensor (common) but you'd want to confirm the hoses to the sensor are in good shape before replacing the sensor.

-Rod

 

Thanks for the feedback. Would a faulty sensor or hoses cause it to run so rough? With my limited experience I would expect the trouble code to appear but the engine continue to run well.

 

A faulty sensor or the vacuum leak caused by a cracked or split hose can certainly cause the engine to run roughly. The computer can only compensate for so much, and a large vacuum leak or defective sensor will cause the PCM to not have good data. It is expecting the various sensors to sense data and report the data to be within certain ranges. When within those ranges, the PCM alters various outputs based on the sensor data. If the sensor fails and provides data well outside the range that the PCM expects, the PCM will usually identify this out of range condition and report it as a diagnostic trouble code, but the PCM cannot always determine if the sensor is the culprit or if what the sensor is sensing is the problem. Likewise, a vacuum leak from a bad hose will cause the input to the sensor to be out of range.

-Rod

 

Well, your advice was dead on. The one hose was badly cracked and I only could see it when I removed from the sensor and inspected it more closely. Both trouble codes cleared and have remained cleared so far after 30 miles of driving. Smooth as kitten now!!!!
Thanks so much!

 

Because those DPFE sensor hoses connect to the exhaust manifold, you will have to replace them with high temp silicon hose.

 

Glad to hear you got it fixed, and thank you for following up on the thread with what you found.

-Rod