147 1.6TS shows DTCs - Alfa Romeo Bulletin Board & Forums

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post #1 of 3 (permalink) Old 12-01-2016, 10:57 AM Thread Starter
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147 1.6TS shows DTCs

A friends 147 1.6TS of 2001 (Euro model) shows DTCs P0141 and P0136 for a short time:

P0141 : Preheating resistance 1 below catalyser
P0136 : Lambda 1 signal below catalyser

Description says, that the problem is in the heater circuit of the lambda-sensor heater, most likely the relay itself or the wiring to it or from it.
DTCs can be cleared, but appear again at colder start.

So, where precisely is this relay located, unfortunately - as the car is not mine - i have no schematics and no service manuals.


164 2.0 T.S 8V (5/1992, Euro spec.)
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post #2 of 3 (permalink) Old 12-03-2016, 06:25 AM
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You can check which parts you need here
Is the 147 in a country where Alfa is/was active when the 147 was in production. If so, go to a dealer or Alfa specialist for tips or guidance.
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post #3 of 3 (permalink) Old 12-03-2016, 08:06 AM Thread Starter
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Thanks a lot, i told the owner do disconnect the 2 connectors, clean them and measure resistance of the probes heating elements, should be the 2 white wires.
Somewhere here i located a wiring diagram for the GTA, there are all 4 heating circuits in parallel sourced from one fuse and one relay, therefore theese 2 sensors also should be wired in parallel and therefore no defective fuse or relay, as the DTC is only for one sensor.

>dealer or "Alfa specialist": the more we can check ourself the better...

164 2.0 T.S 8V (5/1992, Euro spec.)
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