Kelsey Motoring Discussion Forum - fiesta 03 1.4 O2 sensor

CG Motors Ex Member	fiesta 03 1.4 O2 sensor 24.10.10 at 18:18:43 fault code is catalyst system effiency below threshold bank 1, when started from cold it wont idle just cut out however if revved for a few seconds its fine there after. im 99.9% sure its the pre cat O2 sensor as it doesnt do much switching when cold then moves once warm. long term fuelling was roughly 11% lean.
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mac 54 Part of the furniture Offline Posts: 3175	Re: fiesta 03 1.4 O2 sensor Reply #1 - 24.10.10 at 18:47:18 how's the rear one doing ? is it going into c/l ok? trim not bad,
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CG Motors Ex Member	Re: fiesta 03 1.4 O2 sensor Reply #2 - 24.10.10 at 18:55:38 seems ok, what should i be looking for exactly? the volts seem pretty steady.
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18k a year Part of the furniture Offline Posts: 1451	Re: fiesta 03 1.4 O2 sensor Reply #3 - 24.10.10 at 19:17:05 they wont switch when cold untill it goes into closed loop,sounds more like a faulty cat.
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CG Motors Ex Member	Re: fiesta 03 1.4 O2 sensor Reply #4 - 24.10.10 at 20:18:49 however would it cause it to run rough and cut out straight away from cold?
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karl benz

Ex Member

Re: fiesta 03 1.4 O2 sensor
Reply #5 - 24.10.10 at 20:45:33

Subject/Concern: Malfunction indicator lamp (MIL) illuminated in conjunction with diagnostic trouble codes (DTCs) P0030, P0031, P0032, P0053, P0130 - P0134
Model:

Fiesta 2002.25 (11/2001–09/2008) Build Date: 30.11.2001-07.12.2006
Build Code: 1D-6G
Assembly Plant: Cologne
Assembly Plant: Valencia

Should a customer express concern that the malfunction indicator lamp (MIL) is illuminated, the probable cause is over-heating conditions on the heated oxygen (HO2S) sensor causing the following diagnostic trouble codes (DTCs) to be stored in the Powertrain Control Module (PCM).

• P0030: Upstream oxygen sensor heater - control circuit

• P0031: Upstream oxygen sensor heater - short to ground

• P0032: Upstream oxygen sensor heater - short to battery voltage

• P0053: Upstream oxygen sensor heater - resistance

• P0130: Upstream oxygen sensor signal - open to circuit

• P0131: Upstream oxygen sensor signal - short to ground or air leak

• P0132: Upstream oxygen sensor signal - short to battery voltage

• P0133: Upstream oxygen sensor functional

• P0134: HEGO amplitude plausibility

To rectify this concern, a new HO2S in conjunction with a revised calibration for the PCM must be installed.• CAUTIONS:

The PCM MUST be reprogrammed with a revised calibration when the new type HO2S is installed. Use IDS 46 DVD or a later version.

If for any reason a new calibration is loaded then a new type HO2S MUST be installed. Ignoring this instruction will cause the HO2S to fail or can cause driveability issues.

Parts Required
Description Finis Code Quantity
Heated oxygen (HO2S) sensor 1 471 423 1
A revised type HO2S in conjunction with an updated calibration was introduced into production in the different assembly plants by 22.12.2006 (build code 6G).

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CG Motors Ex Member	Re: fiesta 03 1.4 O2 sensor Reply #6 - 24.10.10 at 20:52:50 non of them codes are showing bud, just cat effiency below threshold bank 1, i think its p0240, With it saying bank 1 this mean its before cat hence why i think O2 sensor no 1?
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18k a year Part of the furniture Offline Posts: 1451	Re: fiesta 03 1.4 O2 sensor Reply #7 - 24.10.10 at 20:54:51 Quote: however would it cause it to run rough and cut out straight away from cold? nope
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karl benz

Ex Member

Re: fiesta 03 1.4 O2 sensor
Reply #8 - 24.10.10 at 20:57:34

there's a few more concerns with regard your o2/catalyst concern. but fall out of your build date? give me your vin to confirm.

whats your dtc? p0421

your stalling/cut out issue maybe separate or a calibration update may cure.

we have had concerns/issues with the tp sensors and or tb
and the loom harness.

first up i would check you have good battery before further investigation.

and of course you may need to have pcm updated as well

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CG Motors Ex Member	Re: fiesta 03 1.4 O2 sensor Reply #9 - 24.10.10 at 21:01:13 exhaust fumes dont smell bad at all. as i said usually when watching o2 sensors on my diag gear it says either lean or rich next to the voltage on the o2 sensor this doesnt. dtc is defo p0240 it runs fine once you rev it to 2k for a few seconds. like warming the sensor up, maybe the heater circuits gone on the sensor?
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CG Motors Ex Member	Re: fiesta 03 1.4 O2 sensor Reply #10 - 24.10.10 at 21:06:15 VIN is WFOHXXWPJH2G25883* but sssssh dont tell anyone.
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mac 54 Part of the furniture Offline Posts: 3175	Re: fiesta 03 1.4 O2 sensor Reply #11 - 24.10.10 at 21:09:00 ho2s 1 = pre cat ho2s 2= post cat bank 1 = 4/6 cyl inline engine bank 2 = 2nd bank of v engine p0240 is turbo boost pressure signal
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karl benz Ex Member	Re: fiesta 03 1.4 O2 sensor Reply #12 - 24.10.10 at 21:10:41 mac 54 wrote on 24.10.10 at 21:09:00: ho2s 1 = pre cat ho2s 2= post cat bank 1 = 4/6 cyl inline engine bank 2 = 2nd bank of v engine p0240 is turbo boost pressure signal that's what i thought that's deffo the code mind
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mac 54 Part of the furniture Offline Posts: 3175	Re: fiesta 03 1.4 O2 sensor Reply #13 - 24.10.10 at 21:15:13 the famous p0420,
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CG Motors Ex Member	Re: fiesta 03 1.4 O2 sensor Reply #14 - 24.10.10 at 21:17:02 sorry its p0420 when started just it said the o2 sensor was 0.410v then dropped to 0.205 after a few seconds then upto 0.835 rapidly twitching, assuming its on warmup which it was. when revved upto 2.5k the short term fuelling was 20% rich.
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mac 54 Part of the furniture Offline Posts: 3175	Re: fiesta 03 1.4 O2 sensor Reply #15 - 25.10.10 at 14:03:18 looking good
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chris gilly Ex Member	Re: fiesta 03 1.4 O2 sensor Reply #16 - 25.10.10 at 21:02:56 changed O2 sensor today, for a non genuine one sorted it, EML light cleared.
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karl benz Ex Member	Re: fiesta 03 1.4 O2 sensor Reply #17 - 25.10.10 at 21:15:55 but will it return after its finished its drive cycle vote now
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chris gilly Ex Member	Re: fiesta 03 1.4 O2 sensor Reply #18 - 25.10.10 at 21:20:52 i gave it a nice few drives today hehe
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mac 54 Part of the furniture Offline Posts: 3175	Re: fiesta 03 1.4 O2 sensor Reply #19 - 25.10.10 at 23:03:21 vote - take the bulb out
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