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Old 05-05-2020   #1
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O2 sensor fault

Good Evening folks,

I have a 2009 1.4 grande punto with a suspect o2 sensor circuit fault. I am throwing codes P0130 (O2 Sensor Circuit Bank1 Sensor1) & P1135 with Torque Pro.


Car has had EML with codes for a while so I decided to replace both O2 sensors as these were straight forward enough. Faults cleared temporarily but came back after a short drive.

Therefore I feel I can rule out O2 sensors themselves and look elsewhere.


My only other line of thought is that when I replaced the O2 sensors I also changed spark plugs/coils and one of the coil connectors was damaged. I resecured it pretty well. Could this throw these codes???

If anybody has any experience of these codes together could you please shed some light?

Many Thanks in advance


Mark
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Old 05-05-2020   #2
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Re: O2 sensor fault

Have a look here: https://www.fiatforum.com/punto-ii/3...-look-mes.html

Ziggy 122 was a great source of information !!


BRs, Bernie.

ps: the sensor heater can still be ok, just a bad fuse, relay, wiring ...
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Old 10-05-2020   #3
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Re: O2 sensor fault

Thanks for the link , I'll check the resistance on heater circuit. I'll have a look for fuse diagram 👍

Thanks again will keep updated

Mark
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Old 12-05-2020   #4
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Re: O2 sensor fault

Soooo...
6ohms on O2 sensor , couldn't get meter onto heater wiring to ECU as test leads wouldnt fit into connector pins 🙄

Checked all fuses in engine compt and they were ok. Earth's ok as well from battery to chassis on top of valve cover.

Another symptom to report is power loss/engine stuttering around 2000-3000rpm.

This leads me to a fueling issue?

I will clean map sensor and maybe replace fuel filter as haven't changed this since weve had it.

Any other ideas most welcome 👍

Cheers

Mark
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Old 13-05-2020   #5
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Re: O2 sensor fault

Am I right in saying only diesels have a filter??
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Old 13-05-2020   #6
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Quote Originally Posted by 11thevans View Post
Am I right in saying only diesels have a filter??
No petrol have filter too .
It is likely part of in tank fuel pump.

However You really should check integrity of wiring between o2 sensor and ecu first. I do not think you have fuel issue.
A reader that can give live data of o2 sensor voltage would help you massively.
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Last edited by jackwhoo; 13-05-2020 at 13:22.
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Old 13-05-2020   #7
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Re: O2 sensor fault

Unfolded paper clips may fit into connector block of ecu, unplug it from ecu safely before probing
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Old 13-05-2020   #8
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Re: O2 sensor fault

To clarify you must check all wires between o2 connector and ecu connector have continuity i e very low resistance.
You can do this with a multimeter and long leads.
Disconnect ecu and o2 when doing this.

What brand o2 sensor did you fit?
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Old 13-05-2020   #9
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Re: O2 sensor fault

I doubt very much spark plug/ coils could throw your o2 codes.

Are you still getting o2 heater circuit fault code with new o2 sensor?
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Old 13-05-2020   #10
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Re: O2 sensor fault

Hi Jack, I've still got the old sensor so can cut connector of that and test using leads. The o2 sensors I changed didn't have a brand 🙄 but resistance is OK at 6 ohms? And yes still throwing codes up with new sensors 😔
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Old 13-05-2020   #11
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Quote Originally Posted by jackwhoo View Post
No petrol have filter too .
It is likely part of in tank fuel pump.

However You really should check integrity of wiring between o2 sensor and ecu first. I do not think you have fuel issue.
A reader that can give live data of o2 sensor voltage would help you massively.


I've managed to set up torque to monitor sensor voltages what am I looking for specifically?

The pattern I see is sensor 1 goes high voltage and sensor 2 goes low, there are a few hiccups in the graph where sensor 2 spikes voltage on its own??
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Old 13-05-2020   #12
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Quote Originally Posted by 11thevans View Post
Hi Jack, I've still got the old sensor so can cut connector of that and test using leads. The o2 sensors I changed didn't have a brand 🙄 but resistance is OK at 6 ohms? And yes still throwing codes up with new sensors 😔
Did you fit cheapo o2 sensors from the likes of ebay?
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Old 13-05-2020   #13
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Re: O2 sensor fault

Ignore the o2 sensor after the converter for now as you have not had a code for it.
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Old 13-05-2020   #14
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Re: O2 sensor fault

With engine running at normal temperature. What voltage are you reading from ecu for o2 sensor ,roughly.

Then stop engine , unplug o2 sensor then tell us what the voltage reading from ecu for o2 sensor is.
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Last edited by jackwhoo; 13-05-2020 at 16:23.
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Old 13-05-2020   #15
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Quote Originally Posted by 11thevans View Post
Hi Jack, I've still got the old sensor so can cut connector of that and test using leads. The o2 sensors I changed didn't have a brand 🙄 but resistance is OK at 6 ohms? And yes still throwing codes up with new sensors 😔
Did you work the colour code of the wires on o2 sensor?
Do you have 4 wires? Two white? One grey? One black?
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