2000 Volvo S40 problem starting

2000 VOLVO S40

140,000 MILES • 4 CYL • FWD • AUTOMATIC

ANTONS40

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A few weeks ago my car started having problems starting, now i have to crank for about 5-7 seconds and it gives me a code "P0130, O2 sensor circuit, or missing signal" what could be the cause of it. I have replaced OEM sensor that was in there with the universal and still nothing, i have replaced the spark plugs and now it starts a little better but still not good, and i still have check engine light on. could it be something simple or its a big $$$ problem.
Thanks

Sep 23, 2008 at 12:40 AM

KHLOW2008

CAR REPAIR CONTRIBUTOR
41,814 POSTS

Hi AntonS40,

Thank you for the donation.

Diagnostic Procedure (Signal Missing, P0130)

1. Turn ignition off. Disconnect front HO2S connector.
Check the HO2S connector for contact resistance and oxidation. Repair as necessary. Go to next step.

2. Check the circuit between HO2S connector terminal No. 4 and ECM connector terminal No. 45. Check for an open circuit. Repair as necessary.
If no fault is found, replace HO2S.

Sep 23, 2008 at 12:16 PM

Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.