2006 Volvo C70 Check Engine lite

L.R RAMSEY

MEMBER
2006 VOLVO C70
5 CYL
FWD
AUTOMATIC
90,000 MILES

Hello Sir,
Living in Germany with a American standard Volvo. The car runs fine. Last week the Check Engine lite came on and stayed on after starting and stopping the engine a couple of times during a 20 mile trip. The next day the warning lite did not come on and remained off for about 4 days. Then it reapeared. I took it to a Volvo Dealer while the lite was on, without the correct computer to hook-up to the car, they diagnosed the problem to be a Fuel Sensor, and stated if not replaced the Catylitic Convertor would go out because they are communicating to each other. After leaving the Dealer, the lite remained on the rest of the day.20 miles or so of driving. The next day it was off and has remained off as I have driving over a 100 miles since.

Germany has just recently swithched to E10 gas which is 10% Bio-crap uh Bio-Fuel. Could this be causing the issue?

Could the Fuel Sensor( if the problem) cause the Convertor to go out?

Thank you for your help!

L.R Ramsey

2 Replies

RASMATAZ

MECHANIC
75,992 POSTS

If the oxygen sensor is actually bad or not switching accordingly it will ruin the catalytic converter.

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Monday, March 14th, 2011 AT 9:13 AM

JIS001

MECHANIC
3,408 POSTS

If you have fuel trim codes and the ethanol content of the fuel is more then 10% that will cause the fuel trim problems. If the fault is for a fuel pressure sensor, have them check the fuel pump duty cycle. Normal for most Volvo models here in the USA should be about 35% +/- 5% if it is high you have a restriction somewhere in the fuel system. If it is normal then the fuel pressure sensor circuit should be checked for any opens and shorts. Check the fuel pump control module connector for any oxidation if it is located outside by the tank. If it is inside the vehicle under the rear seats then it will be ok. If all checks out ok then the fuel pressure sensor at the fuel rail is faulty. The solder inside the sensor circuit begins to crack and you get an intermittant open circuit. Replace the sensor and reset the light.