I'm getting P1261 and P1265. I had the original glowplugs replaced with steel Etecno plugs about 50k ago.

Have read here that when the ceramic plugs fail they can break off and leave dangerous bits in the cylinders. Is this true of the steel plugs? I don't know how long these codes have been thrown; I run with the MAF unplugged so CEL is always on. Just plugged in my reader to diagnose a different seemingly unrelated problem (see recent thread on intermittent no-start)

How dangerous are these codes with steel plugs?

Just replace them. The metal ones don't fragment like the ceramic ones.
The codes are just indicating that the current through that circuit is outside of tolerances. (ie. not functioning)

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'06 Lbrty Sprt CRD 150K

Sasquatch
DSS Turbo
CAT-elimntr
Weeks Stg1&2 EGRfix
PV-200
BLING
vent gauges

IDParts
head
cams
rockers
Timing set
ARP studs
eTn1 GX2123 5v GPs

YETI Custom Tune
Flowmaster 8325508
Carter P76611M
GM 12611872
Hayden 2986
GM 15976889
PATC Custom Billet
2010 Ram Hemi Trans
Sonnax 44957
Transgo kit
Cooper 51770

The metal ones can swell and get stuck in the head. Yeah, been there, but not on the liberty.

I recall that the old (1986) Ford F250 GPs did swell at times, but the cure for that was to replace them with Bosch ones which would still fail eventually but didn't swell. Not sure on the failure mode of the Etechno. But if they are open electrically, they won't be heating themselves up anymore.

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2006 KJ CRD