My 1997 TC gives a P0136, P0430, P0302, and P0171 - and then it repeated them.

Ken Rumbarger

Asked by Jan 18, 2014 at 08:02 PM about the 1997 Lincoln Town Car Executive

Question type: Maintenance & Repair

The initial message on the Actron Pocket Scan, (when I had the parts store scan it),
was "8 CODES", then it gave those four and then repeated them. This appears to mean
that I have an O2 Sensor Circuit Bank 1 Sensor 2, (P430 is unclear), Cylinder 2 Misfire
Detected, and System Too Lean Bank 1. For some reason the Actron lookup site
misbehaves when asked for P0430. Tom's answer to someone else suggests it is either
the O2 sensor I already know about, or an exhaust leak. Am I missing anything? Is it
significant that the codes repeated?

2 Answers

okay....the MAIN system ground 1/0awg Battery cable to the chassis ground is not offering the full 12.5 volts that it needs to keep the heated 02 sensor with enough voltage to heat the proper reading to the ECU...the same can be said of all the sensors...they aren't getting PROPER ground...use the wire brush to establish solid connection at the end of the ground lug...reset the trouble codes with your NEW battery and RESTORED ground to the chassis~


P0430 is bank 2 catalytic converter deficiency. Converter needs replaced on drivers side.P0136 Replacing the Rear Heated Oxygen Sensor Bank 1 usually takes care of the problem. .P302 is cylinder 2 misfire which means a new spark plug and coil will fix it.A code P0171 may mean that one or more of the following has happened: •The MAF (Mass Air Flow) Sensor is dirty or faulty Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry. •There could be a vacuum leak downstream of the MAF sensor •Possible cracked vacuum or PCV line/connection •Faulty or stuck open PCV valve •Failed or faulty oxygen sensor (bank 1, sensor 1) •Sticking/plugged or failed fuel injector •Low fuel pressure (possible plugged/dirty fuel filter!) •Exhaust leak between engine and first oxygen sensor Usually it is a vacuum leak or lo fuel pressure which could be fuel filter,fuel pump or both.

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