Finally got around to putting a K&N air filter in my 2000 Disco II. After the install, fired it up and it hesitated before reaching idle speed. After several minutes, ses light came on, so I pulled a P0102, P0112 and P1884 code. Any ideas? Haven't had any major problems with this vehicle since purchased used with 32,000 miles on it. It now has 64,000 miles. Any help would be greatly appreciated.... Nearest dealer is 4 1/2 hours away! Thanks.

 

the aftermarket air filter oil on the filter is sometimes bad on the MAF sensor, you could try to clean the MAF with electrical contact cleaner if it didn't blow the MAF, For future refrance, wash the air filter really good then re oil it lightly, this is common problem. Is it the SES or Check Engine light, if it is the SES you can reset it, i will help you on that if it is.



after fixing the MAF it should take care of the other 2 codes which are associated with the P0102 - MAF circut low input


as far as the codes go heres some info


Mass Air Flow Circuit - Low Input P0102
Mass Air Flow Circuit - High Input P0103
Mass Air Flow Circuit Range / Performance Problem P0101
2. Monitoring Procedure
Summary
Faults with the airflow meter will be detected using three tests. A low range check will look for out of range values. Faults will be detected if the following circumstances are present, no signal (open circuit) at any time with the engine running, or high signal output below a given engine speed. An additional low signal check is performed with the throttle angle and engine speed above threshold values.
Low Range Check
The average value of airflow meter volts is compared to lower limits (AIRFLOW DIAG AFM MIN VOLTAGE) when the engine is running. If the voltage is less than this limit then a counter is incremented, otherwise it is decremented. If the counter reaches a threshold limit, then a fault is present.
High Signal Check
The average value of airflow meter volts is compared to an upper limit (AIRFLOW DIAG AFM MAX VOLTAGE) when the engine speed below a threshold (AIRFLOW DIAG AFM TEST SPEED). If the voltage is greater than this limit then a counter is incremented, otherwise it is decremented. If the counter reaches a threshold limit, then a fault is present.
Low Signal Check
A low signal test will check for an air meter output consistent with other engine parameters.
If the airflow meter gives a low signal when both throttle angle and engine speed are above thresholds (AIRFLOW DIAG THANG THRESH & AIRFLOW DIAG SPEED THRESH respectively), then a fault is present.
If the tests are not passed then the appropriate fault counter, (AIRFLOW DIAG FAULT LIMIT), will be incremented, otherwise it will be decremented.
If the count exceeds a given threshold then a fault is present.
3. Primary Detection Parameter
Airflow meter signal voltage - measured at the ECM input.
4. Fault Criteria Limits
Airflow meter - Low out of range 350mV
Airflow meter - High rationality limit 4.5V
Airflow meter - Low rationality limit 1.1V
5. Monitoring Conditions
The low range check will take place whenever the engine is running; the high signal check will take place when the engine speed is below a given threshold. The low signal check occurs when the throttle angle and engine speed are above respective thresholds.

AIRFLOW DIAG AFM TEST SPEED, the maximum engine speed for the high signal check, 1000 rpm.
AIRFLOW DIAG THANG THRESH, the absolute throttle potentiometer volts, must be above 2.5V.
AIRFLOW DIAG SPEED THRESH, the minimum engine speed for the low signal test, 1500 rpm.
AIRFLOW DIAG FAULT LIMIT, the amount of fault events required to flag a fault, 40 .
The Low Signal Check is inhibited whenever there is a fault present with the throttle position input.



6. Monitoring Time Length / Frequency of Checks
The frequency of the Airflow meter Diagnostic is 10Hz , throughout all engine-operating conditions.
7. Criteria for Storing Fault Code
Two successive trips where the airflow meter diagnostic indicates a failed airflow meter.
8. Criteria for Illuminating MIL
Two successive trips where the airflow meter diagnostic indicates a failed airflow meter.
9. Criteria for Determining Out of Range Input Signals
The airflow meter voltage is range tested as described above. Engine speed signal is checked for correct number of teeth on wheel between missing teeth. Throttle Angle input is subject to maximum & minimum range checks.

 

Since K & N is a sponsor of this site, maybe you could contact them as to your issues ? Or, maybe they will reply here ?
Another common issue is that the air box does not get clamped down properly resulting in bent and deformed locating tabs. This allows unfiltered and turbulent air to cross the sensor and cause problems.

 

Thanks for the replies! I actually took everything apart and reinstalled. Cleared the codes with my scanner and have had no more gremlins! Must have been operator error!!! Thanks again.