My 98 Disco had 10 misfire codes set when I bought it, but all went away (or at least did not comeback) after I reconnected one apark plug wire and repaired a split vacuum hose. Yesterday on my first 30 mile drive, after about 10 miles the Check Engine light flashed for awhile and then stayed on solid and these codes were set. My code reader listed the most common fixes.

P1314 – Bank B misfire (Crank Position Sensor?)
fix 1 replaced crank position sensor


P1313 - Bank A Misfire (above 15% in 200 revolutions - sets check engine light immediately)
Fix 1 replaced plugs, fix 2 replaced wires


P0152 – O2 sensor high voltage bank 2 sensor 1
No fix listed


I erased the codes this morning and restarted briefly and the check engine light stayed off after bulb check.


Is the P0152 a result of misfire or might the other codes be a result of an O2 sensor malfunction?


Would new Plugs and wires be advised or new O2 sensor as the next step?

 

The O2's are tested first when a suspected fuel system fault is present.

So to answer your question if one fault is the result of the other the answer is no. You have two separate issues.

Now knowing the history of these motors and the importance of the O2's in monitoring and reporting to the ECU I would suggest changing both upstream O2's since they only last @ 100k or less. It becomes moot if these are not changed to determine any other existing fuel system fault if they are not in working condition.

 

As far as the 1313/14 it could be the CkPS or a bent tab on the flywheel ring.

 

Just checked O'Reilly's web site and they list two types of O2 sensor for a 98 disco; with "Advanced Evaporative Loss System (AELS)" and without. Does an LE engine have "Advanced Evaporative Loss System (AELS)"? I didn't see it mentioned in the specs.

Seems one of the early fault codes had to do with one O2 sensor heater circuit (P1187?), but it hasn't come back. I remember also looking at the engine data while the engine was running and seeing both upstream sensors reporting the same value (1.02V) and both downstream sensors reporting nearly the same value (.055V and .060V) at idle. Guess I need to set it on engine data view and go for another drive. I Might pull the plugs for inspection first to look for any obvious signs and make sure all wires are firmly attached at both ends.

 

You have AEL as do all 98's.

Sounds like a plan, see what comes up on another drive.